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# Exercise Title Features Description Platform Keywords
1 List of numbers Code Completion When printing the elements in an array, you want commas between the elements, such as CodeCheck Arrays and Array Lists
2 Short words Code Completion You want to collect all “short” words in an array of words, that is, words with at most three characters.... CodeCheck Arrays and Array Lists
3 Select a short word Code Completion You want to pick a particular “short” word in an array of words, that is, words with at most three... CodeCheck Arrays and Array Lists
4 Diagonals on board Code Completion You are given a class similar to the TicTacToe board in Section 7.6, but the board can have more than... CodeCheck Arrays and Array Lists
5 Border on board Code Completion You are given a class similar to the TicTacToe board in Section 7.6, but the board can have more than... CodeCheck Arrays and Array Lists
6 Run lengths Code Completion A run is a sequence of adjacent repeated values. For example, the array with elements CodeCheck Arrays and Array Lists
7 Same beginning and end sequence Code Completion Your task is to determine whether an array has the same sequence of numbers at the beginning and the end,... CodeCheck Arrays and Array Lists
8 Remove short words Code Completion Remove all short words (that is, words of length at most 3) from an array. Move down the remaining array... CodeCheck Arrays and Array Lists
9 Number of even and odd elements Code Completion Count the number of even and odd elements in an array of integers. Since you must return two counts, place... CodeCheck Arrays and Array Lists
10 Letter frequency (count) Code Completion Write a method that computes how often each letter A-Z or a-z occurs in a string. Don't distinguish between upper-... CodeCheck Arrays and Array Lists
11 Letter frequency (percentage) Code Completion Write a method that computes the frequency (as a percentage between 0.0 and 1.0) of each letter A-Z or a-z... CodeCheck Arrays and Array Lists
12 Swap first and second half of array Code Completion Your task is to complete a method that swaps the first and second half of an array of integers. For... CodeCheck Arrays and Array Lists
13 Swap adjacent elements in array Code Completion Your task is to complete a method that swaps adjacent values in an array of integers. For example, if the... CodeCheck Arrays and Array Lists
14 Railfence cypher Code Completion A simple way of encoding a message is the railfence cypher. The message is written downwards and diagonally on rails... CodeCheck Arrays and Array Lists
15 Employee Pay with Overtime Code Completion Employees get paid time and a half for the weekly work hours in excess of 40 hours. For example, an... CodeCheck Branches
16 Middle Letter Code Completion Complete the getMiddle method that gets the middle character from a word if the word length is odd, or the... CodeCheck Branches
17 Check for Valid Answers Code Completion Consider a program that administers multiple-choice quizzes. The student needs to provide a response such as A or D. Your... CodeCheck Branches
18 Overlapping sets Code Completion An open interval is the set of all numbers between a lower and upper bound. In mathematical notation, we write CodeCheck Branches
19 Intersecting Lines Code Completion A non-vertical line in the plane can be described by the slope/y intercept equation CodeCheck Branches
20 Sort Names Code Completion We consider names of people that consist of first and last names, such as Joe Smith. When you sort names,... CodeCheck Branches
21 Number guessing game Code Completion A simple guessing game asks the player to guess a number between 1 and 50. Hints are returned depending on... CodeCheck Branches
22 All the same Code Completion Write a method to test whether four numbers are all the same. For example, CodeCheck Branches
23 All different Code Completion Write a method to test whether three numbers are all different. For example, CodeCheck Branches
24 All the same sign Code Completion Write a method to test whether three numbers have the same sign (positive, zero, or negative). For example, CodeCheck Branches
25 BankAccount with Service Charge Code Completion Change the withdraw method of the BankAccount class so that a charge of $1.00 is deducted for each withdrawal. CodeCheck Classes
26 BankAccount with Transaction Count Code Completion Change the deposit and withdraw methods of the BankAccount class so that a count of transactions is updated. For example,... CodeCheck Classes
27 BankAccount with Bonus for Opening Account Code Completion Implement a BankAccount that pays a bonus of $10 for each new account. CodeCheck Classes
28 ClassSchedule Code Completion Implement a class ClassSchedule with a title (a string), days the class meets (a string), a start meeting time (a... CodeCheck Classes
29 ClassSchedule with setDays and set times Code Completion A ClassSchedule class has been designed to represent a class that is scheduled at given days and times. Sometimes class... CodeCheck Classes
30 ClassSchedule with getDays and set times Code Completion Your task is to write a tester class for the ClassSchedule class given below. You should test the getTime and... CodeCheck Classes
31 XML Map Labels Code Completion The latitude, longitude and place name are used to label a map. Implement a class with latitude and longitude as... CodeCheck Classes
32 XML Map Labels convert to decimal degrees Code Completion The latitude, longitude and place name are used to label a map. Implement a class with latitude and longitude as... CodeCheck Classes
33 Reimplement Person class to increase cohesion Code Completion Consider the Person class below. CodeCheck Designing Classes
34 Swap values by using an array Code Completion A Java method cannot update primitive type parameters. For example, the following method does not work as intended: CodeCheck Designing Classes
35 Preconditions for Sentence constructor Code Completion The constructor of the Sentence class below makes assumptions about the text parameter: CodeCheck Designing Classes
36 Static method for computing number of binary digits in n Code Completion Supply a static method that computes the number of binary digits in a given integer. For example, CodeCheck Designing Classes
37 Static field to count number of objects Code Completion Add a private static variable to the Coin class that counts the total number of coins that were constructed. Also... CodeCheck Designing Classes
38 Reimplement Vehicle class to increase cohesion Code Completion Consider the Vehicle class below. CodeCheck Designing Classes
39 Introduce class to implement method that mutates value Code Completion A Java method cannot update primitive type parameters. For example, the following program cannot work as intended: CodeCheck Designing Classes
40 Preconditions for SalaryBonus constructor Code Completion The constructor of the SalaryBonus class below makes the following assumptions; CodeCheck Designing Classes
41 Static method for counting the number of times a character appears in a string Code Completion Supply a static method that counts the number of times that a specific character appears in a given string. For... CodeCheck Designing Classes
42 Static field to maintain the total value of Coin objects created Code Completion Add a private static variable to the Coin class that maintains the total value of all coins that were constructed.... CodeCheck Designing Classes
43 Liftoff threads Code Completion We want to simulate multiple rocket launches by ACME Rocket Inc. Each launch has a countdown, like this CodeCheck Concurrency
44 Synchronizing multiple summation threads Code Completion We will divide the work of computing the sum of all values in an array over multiple threads. Each thread... CodeCheck Concurrency
45 Using conditions for completion count Code Completion We will divide the work of computing the maximum of all values in an array over multiple threads. Each thread... CodeCheck Concurrency
46 Launching multiple summation threads and using yield Code Completion We will divide the work of computing the sum of all values in an array over multiple threads. Each thread... CodeCheck Concurrency
47 A slow sorting algorithm with two threads Code Completion Consider the following algorithm to sort an array of strings and remove duplicates, using two threads. CodeCheck Concurrency
48 Normalizing Angles Code Completion When you work with angle measurements, you often want them normalized or converted into the range between 0 . .... CodeCheck Fundamental Data Types
49 Last n Characters Code Completion Write a method that gets the last n characters from a string. For example, last("Hello, World!", 5) should return the... CodeCheck Fundamental Data Types
50 Length of Line Code Completion Complete the following function that computes the length of a line segment with end points (x1, y1) and (x2, y2).... CodeCheck Fundamental Data Types
51 Initials Code Completion Complete the initials method in the class below. For example, the call initials("Harry", "Joseph", "Hacker") should return the string "HJH". CodeCheck Fundamental Data Types
52 Timer Code Completion The following timer class measures the total time that has elapsed after timing a number of events. Your job is... CodeCheck Fundamental Data Types
53 Decimal Degrees Code Completion Latitude and longitude are measured in degrees, minutes and seconds. As with time measurements, there are 60 seconds to a... CodeCheck Fundamental Data Types
54 Degree, Minute, Second Code Completion Latitude and longitude can be expressed in the form of decimal degrees. Another form, often used on maps, is degrees,... CodeCheck Fundamental Data Types
55 Distance between two points on earth Code Completion A position on the planet Earth is specified by latitude and longitude (in degrees). The distance between two points on... CodeCheck Fundamental Data Types
56 Swap first and last name Code Completion Write a method getLastFirst whose parameter is a string containing a name such as "Harry Smith" and that returns a... CodeCheck Fundamental Data Types
57 Change Firstname Lastname to Lastname, Firstname Code Completion Fred fills out his time sheet at work, but he needs to provide the number of minutes worked. He only... CodeCheck Fundamental Data Types
58 Generic matrix class as array of arrays Code Completion Your task is to complete the implementation of a generic Matrix class. A matrix is a two-dimensional arrangement of elements.... CodeCheck Generic Types
59 Generic matrix class as linear array Code Completion Your task is to complete the implementation of a generic Matrix class. A matrix is a two-dimensional arrangement of elements.... CodeCheck Generic Types
60 Generic matrix class as a map with integer keys Code Completion Your task is to complete the implementation of a generic Matrix class. A matrix is a two-dimensional arrangement of elements.... CodeCheck Generic Types
61 Generic matrix class as a map with integer pair keys Code Completion Your task is to complete the implementation of a generic Matrix class. A matrix is a two-dimensional arrangement of elements.... CodeCheck Generic Types
62 Pair class with compareTo method Code Completion We sometimes want to compare two Pair objects, for example, when using pairs as keys in a tree map. CodeCheck Generic Types
63 Generic pair with min method Code Completion CodeCheck Generic Types
64 Generic method for filling an array Code Completion The class below has a static method which sets all elements of an array to a value. The method is... CodeCheck Generic Types
65 Generic replicate method Code Completion Implement the generic replicate method. It should return a list containing multiple copies of the given value. CodeCheck Generic Types
66 Finding the first match for a predicate Code Completion Recall that a predicate is a method with a Boolean return value. The Predicate interface can be used to test... CodeCheck Generic Types
67 Finding all matches for a predicate Code Completion Recall that a predicate is a method with a Boolean return value. The Predicate interface can be used to test... CodeCheck Generic Types
68 Extend ASCII art rectangle to filled rectangle Code Completion You are given a class Rectangle that produces ASCII art rectangles such as the following: CodeCheck Inheritance
69 Extend ASCII art rectangle to tiled rectangle Code Completion You are given a class Rectangle that produces ASCII art rectangles such as the following: CodeCheck Inheritance
70 Implement LabeledPoint.toString Code Completion A labeled point has an x- and y-position and a label. CodeCheck Inheritance
71 Implement LabeledPoint.equals Code Completion A labeled point has an x- and y-position and a label. CodeCheck Inheritance
72 Implement Tile.translate Code Completion A Tile class extends Rectangle. It is to be used for non-overlapping tilings. Your task is to override the translate... CodeCheck Inheritance
73 Auto extending Vehicle and overriding getID Code Completion All vehicles used for transportation in the U.S. must have identification, which varies according to the type of vehicle. For... CodeCheck Inheritance
74 Inherit and call a superclass constructor Code Completion Complete the Car class below so that it inherits from the given Vehicle class. Cars lose value over time. In... CodeCheck Inheritance
75 An enum type describing chemical elements Code Completion Enumerated types in Java are quite powerful, in that they can contain methods and instance variables. An enum type class... CodeCheck Inheritance
76 Using an Abstract Class Code Completion Light bulbs can be identified by type and can be measured by the amount of lumens produced per watt of... CodeCheck Inheritance
77 Overriding the equals Method Code Completion All vehicles used for transportation in the U.S. must have identification, which varies according to the type of vehicle. For... CodeCheck Inheritance
78 Make Sentence implement Measurable Code Completion Complete the Sentence class below so that it implements the Measurable interface. The measure of a sentence should be the... CodeCheck Interfaces
79 Make a measurer for words Code Completion In this exercise, we use the Word class from chapter 6 (with the bugs fixed). You should not change the... CodeCheck Interfaces
80 Implement the Doublable interface Code Completion Some objects can be doubled, for example a bank account. The result would be a bank account with twice the... CodeCheck Interfaces
81 Provide a RectangleDoubler class that implements the Doubler interface Code Completion Some objects can be doubled, for example a bank account. The result would be a bank account with twice the... CodeCheck Interfaces
82 Implement an Interface to Change Rectangle Dimensions Code Completion Complete the RectangleManager class below so that it implements the given Adjuster interface. The implementation should use the h and... CodeCheck Interfaces
83 Implement an Interface to Provide Museum's Car Count Code Completion Complete the CarMuseum class below so that it implements the given Measurable interface. Your tasks are as follows: CodeCheck Interfaces
84 Using Anonymous Objects Code Completion Modify the PolygonTester class below so that it uses anonymous objects where possible. Objects that are only used once should... CodeCheck Interfaces
85 Creating the Movement Interface Code Completion Create the Movement interface below and the abstract methods move and getPosition, which are implemented by the Ship and Auto... CodeCheck Interfaces
86 Using instanceof for Converting Between Animal Types Code Completion The Cat and Dog class below implement the Animal interface. All animals have names, but only dogs do tricks. Implement... CodeCheck Interfaces
87 Reversing the lines in a file Code Completion Your task is to read a file containing lines of text, and to write another file that contains these lines... CodeCheck Input and Output
88 Find longest word in file Code Completion Your task is to open a file, read all words in the file, and find the longest word in the... CodeCheck Input and Output
89 Throw IllegalArgumentException in SavingsAccount constructor Code Completion The SavingsAccount class given below is similar to that of Chapter 9. It should be illegal to construct savings accounts... CodeCheck Input and Output
90 Catching a NumberFormatException Code Completion In the following code, catch the NumberFormatException that is thrown when the argument of Integer.parseInt does not represent a number. CodeCheck Input and Output
91 Add throws clause to web reader Code Completion The checkURL method below checks whether a web site contains data. Checked exceptions can be thrown in the code. Your... CodeCheck Input and Output
92 Processing exam scores Code Completion Your task is to read a file containing exam scores, and to write another file that contains the results of... CodeCheck Input and Output
93 Processing names Code Completion Your task is to read an input file containing a name on each line, and then write an output file... CodeCheck Input and Output
94 Converting temperatures Code Completion Your task is to read an input file containing a month name followed by the average maximum temperature for that... CodeCheck Input and Output
95 Throw IllegalArgumentException in Vehicle constructor Code Completion The Vehicle class given below is used to represent various types of self-propelled vehicles. It should be illegal to construct... CodeCheck Input and Output
96 Design IllegalNumberOfWheels Exception Code Completion The following Vehicle class throws a custom exception of type IllegalNumberOfWheels. Your task is to implement this exception class. The... CodeCheck Input and Output
97 SuperCaesar Cipher Code Completion The SuperCaesar cipher is just like the Caesar cipher, except that the key value is incremented in each step. For... CodeCheck Advanced Input and Output
98 HyperCaesar cipher Code Completion The HyperCaesar cipher is just like the Caesar cipher, except that the key for each step is the initial key... CodeCheck Advanced Input and Output
99 Swap As and Os in RandomAccessFile Code Completion Your task is to swap all letters A with O and all letters a with o in a RandomAccessFile. Simply... CodeCheck Advanced Input and Output
100 Swap adjacent characters in a RandomAccessFile Code Completion Your task is to swap adjacent letters in a RandomAccessFile. Simply read two bytes, back up by two bytes, and... CodeCheck Advanced Input and Output
101 Reading a serialized array of objects Code Completion Your task is to read a serialized array of objects. You are given a FileInputStream, and you need to read... CodeCheck Advanced Input and Output
102 Remove short words Code Completion Your task is to remove all short words (that is, words with at most 3 characters) from a linked list. CodeCheck Linear Data Structures
103 Duplicate short words Code Completion Your task is to duplicate all short words (that is, words with at most 3 characters) in a linked list.... CodeCheck Linear Data Structures
104 Concatenate elements backwards Code Completion Your task is to concatenate all elements in a linked list of strings backwards, starting at the end of the... CodeCheck Linear Data Structures
105 Rotate linked list by manipulating nodes Code Completion Your task is to add a rotate method to the LinkedList class of Section 15.2 that rotates the elements of... CodeCheck Linear Data Structures
106 Using a stack for checking balanced parentheses Code Completion A stack can be used to check whether an arithmetic expression such as CodeCheck Linear Data Structures
107 Remove all but first two elements from linked list Code Completion Write a method that removes all but the first two elements from a linked list, using an iterator. You may... CodeCheck Linear Data Structures
108 Add an element to the front and back of a linked list Code Completion Implement a method that adds an element to the beginning of a linked list and another at the end. CodeCheck Linear Data Structures
109 Add an element after the first and before the last Code Completion Write a method that adds an element after the first and another before the last element of a nonempty linked... CodeCheck Linear Data Structures
110 Implement addLast using raw nodes Code Completion Implement the addLast method in this simplified LinkedList class. CodeCheck Linear Data Structures
111 Palindrome testing with stack and queue Code Completion Using a queue and a stack, implement a method that tests whether a sequence of numbers is a palindrome, that... CodeCheck Linear Data Structures
112 GetVowels Code Completion Your task is to write a method getVowels that gets the vowels in a string. For example, the call getVowels("Hello,... CodeCheck Loops
113 EvenSum Code Completion Your task is to write a method evenSum that computes the sum of all even numbers between two given numbers.... CodeCheck Loops
114 Stutter Code Completion Your task is to write a method stutter that repeats all letters t in a string. For example, the call... CodeCheck Loops
115 Count perfect squares Code Completion Your task is to write a method countPerfectSquares that counts all perfect squares in a given range. For example, the... CodeCheck Loops
116 Count Sevens Code Completion Your task is to write a method countSevens that counts the number of digits equal to 7 in a given... CodeCheck Loops
117 Format Phone Number Code Completion When people enter their telephone numbers into a form they use many different formats. Some examples are: CodeCheck Loops
118 Color codes for double-sized image Code Completion Consider an image that is composed of a number of colored small squares, each colored in one of these 8... CodeCheck Loops
119 Run-Length Encoding Code Completion A simple technique for compressing an image is run-length encoding. The color of each pixel or area is specified for... CodeCheck Loops
120 Picture of Colored Boxes Code Completion Your task is to write a method that produces images from strings describing color values. CodeCheck Loops
121 Balloon Filled Sky Code Completion Your task is to draw n balloons centered at random positions, each with a randomly colored circle and a white... CodeCheck Loops
122 Oracle client Code Completion Your task is to connect to the oracle server at port 7777 on the local host. The oracle protocol is... CodeCheck Networking
123 Oracle server Code Completion Your task is to provide an oracle server at port 7777 on the local host. The oracle protocol is very... CodeCheck Networking
124 Cookies with raw sockets Code Completion Many web site instruct browsers to set cookies, small pieces of information that the browser will send back to the... CodeCheck Networking
125 Cookies with URLConnection Code Completion Many web site instruct browsers to set cookies, small pieces of information that the browser will send back to the... CodeCheck Networking
126 Popular boys and girls names Code Completion The web sites http://www.census.gov/genealogy/names/dist.male.first and http://www.census.gov/genealogy/names/dist.female.first contain baby names sorted by popularity. The format is very simple: name, frequency, cumulative... CodeCheck Networking
127 371t3 hack3rs Code Completion The "elite hackers" like to make their text look cool by replacing characters with similar-looking symbols: e becomes 3, i... CodeCheck Objects
128 Average word length Code Completion Complete the following program to compute the average length of the words. Invoke the appropriate method to compute the length... CodeCheck Objects
129 Rectangle construction Code Completion Your task is to construct a rectangle with area 51. CodeCheck Objects
130 Translate square so that intersection has area 10 Code Completion Your task is to translate the rectangle box2 in the program below so that the intersection of box and box2... CodeCheck Objects
131 Red checkerboard squares Code Completion Your task is to draw a simple checkerboard pattern. CodeCheck Objects
132 Traffic light Code Completion Your task is to draw the lamps in a traffic light. CodeCheck Objects
133 Make stronger password Code Completion A stronger password can be created by replacing characters with similar-looking symbols: e becomes 3, i becomes 1, a becomes... CodeCheck Objects
134 Reversing a string with StringBuilder Code Completion StringBuilder is another class that provides methods to manipulate strings. Look in the StringBuilder class API for information on the... CodeCheck Objects
135 Uppercase international letters Code Completion Your task is to find out what happens when you call the toUpperCase method on strings that contain accented characters... CodeCheck Objects
136 Draw intersection of rectangles Code Completion Draw two intersecting rectangles and color their intersection black. CodeCheck Objects
137 Rectangle with 3D effect Code Completion Complete the ThreeDButtonComponent class to draw a button with shading. The button is a Rectangle, with very thin rectangles on... CodeCheck Objects
138 Drawing with fill3DRect Code Completion Complete the ThreeButtonComponent class to draw three boxes that look like push buttons. Each box is a Rectangle drawn in... CodeCheck Objects
139 Using inheritance for modeling Square class Code Completion Intuitively, every square is a rectangle, so it is tempting to use inheritance for implementing a square: CodeCheck Object-Oriented Design
140 Using aggregation for modeling Square class Code Completion Intuitively, every square is a rectangle, so it is tempting to use inheritance for implementing a square: CodeCheck Object-Oriented Design
141 Use Money interface in invoice program Code Completion The invoice program assumes that prices are given in dollar. Other currencies have different rules, and it makes sense to... CodeCheck Object-Oriented Design
142 Add transfer to ATM Code Completion Add the capability of transferring money from the currently selected account to the other account from the same account holder... CodeCheck Object-Oriented Design
143 Add user interface for balance transfer Code Completion In this assignment, a transfer method has been added to the ATM class of section 12.5: CodeCheck Object-Oriented Design
144 Collaborator classes Code Completion In some situations, a class needs the help of other classes to complete a task. These other classes are called... CodeCheck Object-Oriented Design
145 Using Aggegation Code Completion A team has players. Use aggregation to complete the class constructor and the listTeam and addPlayer methods of the Team... CodeCheck Object-Oriented Design
146 Relationships between classes and interfaces Code Completion A stamp has a descriptive name, a face value, and an issuing country. Stamps have a measurable value (the face... CodeCheck Object-Oriented Design
147 Pyramid volume Code Completion A pyramid is built by stacking up cubes: CodeCheck Recursion
148 Zipper words Code Completion Two strings of equal length can be interlaced like the teeth of a zipper to form a new word. For... CodeCheck Recursion
149 Zipper words with helper method Code Completion Two strings of equal length can be interlaced like the teeth of a zipper to form a new word. For... CodeCheck Recursion
150 ZipperWordGenerator Code Completion You are given two strings of equal length. Your task is to generate all zipper words that can be produced... CodeCheck Recursion
151 A recursive squid (square in diamond) Code Completion A recursive squid is a square in a diamond containing another squid. CodeCheck Recursion
152 Reverse an integer Code Completion We want to implement a method that reverses the digits in an integer. For example, reverseInt(3456) should yield 6543. CodeCheck Recursion
153 Reverse an integer with helper method Code Completion We want to implement a method that reverses the digits in an integer. For example, reverseDigits(3456) should yield 6543. CodeCheck Recursion
154 Multiplication as recursive addition Code Completion Complete the multiply method in the MyMethods class so that it returns the product of the non-negative integer n multipled... CodeCheck Recursion
155 Recursive toString for array Code Completion Complete the static mkString method in the MyMethods class so that it formats an array of int values, with the... CodeCheck Recursion
156 Reverse toString for array Code Completion Complete the static toStringInReverse method in the MyMethods class so that it formats an array of int values in reverse... CodeCheck Recursion
157 Extract uppercase letters from string Code Completion Modify the static return upperCase method in the MyMethods class so that it returns a string of the upper case... CodeCheck Recursion
158 Recursive string reversal with helper method Code Completion Complete the static reverseHelper method so that the reverse method returns a String that is the reverse of the parameter... CodeCheck Recursion
159 Find vowels in string with recursive helper method Code Completion Complete the MyMethods class so that the static vowels method returns a string of the vowels of the string parameter.... CodeCheck Recursion
160 Modified SelectionSort Code Completion Your task is to modify the selection sort algorithm so that you find the largest element and swap it to... CodeCheck Sorting and Searching
161 Count visits in selection sort Code Completion In section 14.3, we approximated a count of the array visits in selection sort. Your task is to provide an... CodeCheck Sorting and Searching
162 Count visits in selection sort Code Completion In section 14.5, we approximated a count of the array visits in merge sort. Your task is to provide an... CodeCheck Sorting and Searching
163 Sort real data Code Completion Your task is to sort an array list of path names such as CodeCheck Sorting and Searching
164 Number guesser Code Completion Your task is to implement a number guesser that works on the principle of a binary search. In each step,... CodeCheck Sorting and Searching
165 Selection sort modification placing only min and max Code Completion Your task is to modify the selection sort algorithm so that you find the largest element and swap it to... CodeCheck Sorting and Searching
166 Selection sort modification placing even before odd Code Completion Implement a modification of the SelectionSorter class that reorders the array to have even elements followed by odd ones. Follow... CodeCheck Sorting and Searching
167 Merge sort modification placing even before odd Code Completion Modify the merge sort algorithm so that, instead of sorting an array, it rearranges places all even elements before the... CodeCheck Sorting and Searching
168 Descending merge sort Code Completion CodeCheck Sorting and Searching
169 Selection sort modification, placing the largest element first Code Completion Your task is to modify the selection sort algorithm so that you find the largest element and swap it to... CodeCheck Sorting and Searching
170 Letter set Code Completion Your task is to produce a set of all letters in a string. Letters are represented as strings of length... CodeCheck Tree Structures
171 Letter frequency map Code Completion Your task is to produce a map of the frequencies of all letters in a string. Letters are represented as... CodeCheck Tree Structures
172 Path lengths in binary tree Code Completion Your task is to compute a set of all path lengths in a binary tree. For example, given this tree, CodeCheck Tree Structures
173 Hash code for LabeledPoint Code Completion Implement the hashCode method for the LabeledPoint class so that equal objects have the same hash code and that unequal... CodeCheck Tree Structures
174 A fast priority queue Code Completion It is possible to provide a fast priority queue implementation if the inserted items have a bounded number of integer... CodeCheck Tree Structures
175 Unique words in two string sets Code Completion Implement a method that receives two arrays of strings and determines which words are unique to each. CodeCheck Tree Structures
176 Map words to their lengths Code Completion Given an array of strings, create a tree map with each string as a key and its corresponding value the... CodeCheck Tree Structures
177 Map word lengths to words Code Completion Given an array of strings, create a tree map whose keys are the string lengths and whose values are the... CodeCheck Tree Structures
178 Hash code for Person class Code Completion When you add instances of the given Person class in a HashSet, the resulting hash set is too large. Evidently,... CodeCheck Tree Structures
179 Make Person class comparable Code Completion The program below will fail to run because the Person class does not implement the Comparable interface. Modify the class... CodeCheck Tree Structures
180 Read XML from string or file. Code Completion You are given a string that is either valid XML (when it starts with a '<' character) or the name... CodeCheck XML
181 How many items in this RSS file? Code Completion An RSS file contains a sequence of item elements inside a channel element. Here is a sample RSS file: CodeCheck XML
182 Get a title from an RSS file Code Completion An RSS file contains a sequence of item elements inside a channel element. Here is a sample RSS file: CodeCheck XML
183 Get the version attribute from an RSS file Code Completion An RSS file describes a set of news items. Here is a sample RSS file: CodeCheck XML
184 Get the version attribute from an RSS file Code Completion An RSS file describes a set of news items. Here is a sample RSS file: CodeCheck XML
185 Given a two-dimensional array of integers, return the average of the four corner elements. Code Completion Given a two-dimensional array of integers, return the average of the four corner elements. CodeCheck Two-Dimensional Arrays, No Loops
186 Given a two-dimensional array of integers, return the middle element if both the row and column lenghts are odd, or the average of the two or four middle elements of one or both is even. Code Completion Given a two-dimensional array of integers, return the middle element if both the row and column lenghts are odd, or... CodeCheck Two-Dimensional Arrays, No Loops
187 Given a two-dimensional array of integers and a string N, E, S, W, give the middle element along the border in the given compass direction, or the average of the two middle ones if the border length is even. Code Completion Given a two-dimensional array of integers and a string N, E, S, W, give the middle element along the border... CodeCheck Two-Dimensional Arrays, No Loops
188 Given a two-dimensional array of integers and a string NW, NW, SW, SE, return the sum of the four elements in the given compass direction. Code Completion Given a two-dimensional array of integers and a string NW, NW, SW, SE, return the sum of the four elements... CodeCheck Two-Dimensional Arrays, No Loops
189 Given a two-dimensional array of integers, row/column indexes r, c, and a string N E S W, return the neighbor in that direction, or 0 if it doesn't exist. Code Completion Given a two-dimensional array of integers, row/column indexes r, c, and a string N E S W, return the neighbor... CodeCheck Two-Dimensional Arrays, No Loops
190 Repeat with NW NE SW SE. Code Completion Repeat with NW NE SW SE. CodeCheck Two-Dimensional Arrays, No Loops
191 Given a two-dimensional array of integers and row/column indexes r, c, return the number of neighbors (not counting the element itself). Code Completion Given a two-dimensional array of integers and row/column indexes r, c, return the number of neighbors (not counting the element... CodeCheck Two-Dimensional Arrays, No Loops
192 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Two-Dimensional Arrays, No Loops
193 Given an array of integers of length ≥ 4, return the average of the first two and last two elements. Code Completion Given an array of integers of length ≥ 4, return the average of the first two and last two elements. CodeCheck Arrays - Simple Exercises, No loops
194 Given an array of integers of length ≥ 3, return the average of the first, last, and middle element (or the two middle elements if the length is even). Code Completion Given an array of integers of length ≥ 3, return the average of the first, last, and middle element (or... CodeCheck Arrays - Simple Exercises, No loops
195 Given an array of integers, swap the first and last elements. Code Completion Given an array of integers, swap the first and last elements. CodeCheck Arrays - Simple Exercises, No loops
196 Given an array of integers, swap the first two and the last two elements. Code Completion Given an array of integers, swap the first two and the last two elements. CodeCheck Arrays - Simple Exercises, No loops
197 Given an input string, print the string with the first and last letter removed if they were equal, or the original string if they were not. Code Completion Given an input string, print the string with the first and last letter removed if they were equal, or the... CodeCheck Branches, Branches Without Functions
198 Given an actual time and an alarm clock time, both in “military” format (such as 0730 for 7:30am), print how many more minutes before the alarm rings. Code Completion Given an actual time and an alarm clock time, both in “military” format (such as 0730 for 7:30am), print how... CodeCheck Branches, Branches Without Functions
199 Repeat the preceding exercise for U. Code Completion Repeat the preceding exercise for U.S. time (e.g. 7:30am). CodeCheck Branches, Branches Without Functions
200 Given a point with integer coordinates (x, y) and a compass direction N, E, S, W, print the neigboring lattice point. Code Completion Given a point with integer coordinates (x, y) and a compass direction N, E, S, W, print the neigboring lattice... CodeCheck Branches, Branches Without Functions
201 Repeat with compass directions NW, NE, SW, SE. Code Completion Repeat with compass directions NW, NE, SW, SE. CodeCheck Branches, Branches Without Functions
202 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches Without Functions
203 On a chessboard, fields are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, fields are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches Without Functions
204 Given the x- and y-coordinates of a point, print whether the point lies in the first, second, third, or fourth quadrant plane, or on the x-axis, or on the y-axis, or the origin. Code Completion Given the x- and y-coordinates of a point, print whether the point lies in the first, second, third, or fourth... CodeCheck Branches, Branches Without Functions
205 Given three numbers x, y, z, determine if one of them is the sum of the two others, and then print out the equation. Code Completion Given three numbers x, y, z, determine if one of them is the sum of the two others, and then... CodeCheck Branches, Branches Without Functions
206 Given three numbers x, y, z, print out how whether they are all distinct, two are the same, or all three are the same. Code Completion Given three numbers x, y, z, print out how whether they are all distinct, two are the same, or all... CodeCheck Branches, Branches Without Functions
207 Given two integers x and y, print their sum, but if it is more than 100 or less than 0, print "out of range". Code Completion Given two integers x and y, print their sum, but if it is more than 100 or less than 0,... CodeCheck Branches, Branches Without Functions
208 Given three integers x, y, z, print the sum of the odd integers. Code Completion Given three integers x, y, z, print the sum of the odd integers. CodeCheck Branches, Branches Without Functions
209 Given three input strings, print all but the shortest one. Code Completion Given three input strings, print all but the shortest one. CodeCheck Branches, Branches Without Functions
210 Given a two-dimensional array of integers, return the number of distinct elements. Code Completion Given a two-dimensional array of integers, return the number of distinct elements. CodeCheck Two-Dimensional Arrays, Complex Loops
211 Given a two-dimensional array of integers, remove any adjacent duplicate rows by filling the duplicates with zeroes. Code Completion Given a two-dimensional array of integers, remove any adjacent duplicate rows by filling the duplicates with zeroes. CodeCheck Two-Dimensional Arrays, Complex Loops
212 Given a two-dimensional array of integers, return the index of the first row that is entirely filled with zeroes. Code Completion Given a two-dimensional array of integers, return the index of the first row that is entirely filled with zeroes. CodeCheck Two-Dimensional Arrays, Complex Loops
213 Given a two-dimensional array of integers, return the index of the first row that is entirely filled with zeroes. Code Completion Given a two-dimensional array of integers, return the index of the first row that is entirely filled with zeroes. < CodeCheck Two-Dimensional Arrays, Complex Loops
214 Given a two-dimensional array of integers, return the position of the largest square subarray filled with zeroes, as an array of length 2. Code Completion Given a two-dimensional array of integers, return the position of the largest square subarray filled with zeroes, as an array... CodeCheck Two-Dimensional Arrays, Complex Loops
215 Repeat the previous exercise with subarrays that are not necessarily square. Code Completion Repeat the previous exercise with subarrays that are not necessarily square. CodeCheck Two-Dimensional Arrays, Complex Loops
216 Given an array of integers, count how many elements are negative. Code Completion Given an array of integers, count how many elements are negative. CodeCheck Arrays - Simple Exercises, Counting Elements
217 Given an array a, count how many times the ith element from the front equals the ith element from the back. Code Completion Given an array a, count how many times the ith element from the front equals the ith element from the... CodeCheck Arrays - Simple Exercises, Counting Elements
218 Given an array of integers and two values a and b, count how many elements are at least a and at most b. Code Completion Given an array of integers and two values a and b, count how many elements are at least a and... CodeCheck Arrays - Simple Exercises, Counting Elements
219 Given an array of integers, return the most frequent element. Code Completion Given an array of integers, return the most frequent element. If there is more than one element with maximum frequency,... CodeCheck Arrays - Simple Exercises, Counting Elements
220 Given an array of integers, return an array of all elements that occur with maximum frequency. Code Completion Given an array of integers, return an array of all elements that occur with maximum frequency. CodeCheck Arrays - Simple Exercises, Counting Elements
221 Given an array of integers, return the position of the first element that occurs more than once, or -1 if all elements occur exactly once. Code Completion Given an array of integers, return the position of the first element that occurs more than once, or -1 if... CodeCheck Arrays - Simple Exercises, Counting Elements
222 Given an array of integers, return an array of all elements that occur exactly once. Code Completion Given an array of integers, return an array of all elements that occur exactly once. CodeCheck Arrays - Simple Exercises, Counting Elements
223 Given an array of integers, remove all elements that occur more than once, leaving the first occurrence. Code Completion Given an array of integers, remove all elements that occur more than once, leaving the first occurrence. CodeCheck Arrays - Simple Exercises, Counting Elements
224 Given two arrays of integers a and b of the same length, count the number of positions where the arrays have the same elements. Code Completion Given two arrays of integers a and b of the same length, count the number of positions where the arrays... CodeCheck Arrays - Simple Exercises, Counting Elements
225 Given two arrays of integers a and b of the same length, count the number of positions where the array elements differ by at least 2. Code Completion Given two arrays of integers a and b of the same length, count the number of positions where the array... CodeCheck Arrays - Simple Exercises, Counting Elements
226 Given two arrays a and b, remove all elements of b from a. Code Completion Given two arrays a and b, remove all elements of b from a. CodeCheck Arrays - Simple Exercises, Double Loops
227 Given two arrays a and b, return an array that contains all elements occurring in a but not in b. Code Completion Given two arrays a and b, return an array that contains all elements occurring in a but not in b. CodeCheck Arrays - Simple Exercises, Double Loops
228 Given an array a, return the longest n so that the first n elements equal the last n elements. Code Completion Given an array a, return the longest n so that the first n elements equal the last n elements. CodeCheck Arrays - Simple Exercises, Double Loops
229 Given an array of integers, return the largest sum of consecutive elements. Code Completion Given an array of integers, return the largest sum of consecutive elements. CodeCheck Arrays - Simple Exercises, Double Loops
230 Given an array of integers, return the largest sequence whose reverse also occurs somewhere in the array. Code Completion Given an array of integers, return the largest sequence whose reverse also occurs somewhere in the array. CodeCheck Arrays - Simple Exercises, Double Loops
231 Given an array a of integers, return an array of all elements of a that occur exactly once. Code Completion Given an array a of integers, return an array of all elements of a that occur exactly once. CodeCheck Arrays - Simple Exercises, Double Loops
232 Given an array of integers, return an array of arrays of length 2, containing each unique element together with its frequency. Code Completion Given an array of integers, return an array of arrays of length 2, containing each unique element together with its... CodeCheck Arrays - Simple Exercises, Double Loops
233 Given an array of integers, return the position of the longest subsequence of consecutive integers a, a + 1, a + 2, . Code Completion Given an array of integers, return the position of the longest subsequence of consecutive integers a, a + 1, a... CodeCheck Arrays - Simple Exercises, Double Loops
234 Given an integer n, fill an array of length n with 1 -1 1 -1 . Code Completion Given an integer n, fill an array of length n with 1 -1 1 -1 ... CodeCheck Arrays - Simple Exercises, Filling
235 Given integers n and k, fill an array of length n with 0 1 2 . Code Completion Given integers n and k, fill an array of length n with 0 1 2 ... k-1 0 1 2... CodeCheck Arrays - Simple Exercises, Filling
236 Given integers a and b, fill an array with a, a + 1, a + 2, . Code Completion Given integers a and b, fill an array with a, a + 1, a + 2, ..., b. CodeCheck Arrays - Simple Exercises, Filling
237 Given integers a and b, fill an array containing all even numbers that are at least a and at most b. Code Completion Given integers a and b, fill an array containing all even numbers that are at least a and at most... CodeCheck Arrays - Simple Exercises, Filling
238 Given an integer n, fill an array with 1 2 2 3 3 3 4 4 4 4 . Code Completion Given an integer n, fill an array with 1 2 2 3 3 3 4 4 4 4 ... and... CodeCheck Arrays - Simple Exercises, Filling
239 Given an array of integers and a value, return the position of the last occurrence of the value in the array, or -1 if the value does not exist. Code Completion Given an array of integers and a value, return the position of the last occurrence of the value in the... CodeCheck Arrays - Simple Exercises, Finding Elements
240 Given an array of integers and a value, return the difference between the last and first position of the value in the array, or -1 if the value does not exist. Code Completion Given an array of integers and a value, return the difference between the last and first position of the value... CodeCheck Arrays - Simple Exercises, Finding Elements
241 Given an array of integers and a value, fill an array with all positions of the value in the array. Code Completion Given an array of integers and a value, fill an array with all positions of the value in the array. CodeCheck Arrays - Simple Exercises, Finding Elements
242 Given an array of integers and a value, return the position of the element that is closest to the value. Code Completion Given an array of integers and a value, return the position of the element that is closest to the value.... CodeCheck Arrays - Simple Exercises, Finding Elements
243 Given two arrays of integers of the same length, return the first position where their elements are the same. Code Completion Given two arrays of integers of the same length, return the first position where their elements are the same. CodeCheck Arrays - Simple Exercises, Finding Elements
244 Given two arrays of integers of the same length, return the first position where their elements differ. Code Completion Given two arrays of integers of the same length, return the first position where their elements differ. CodeCheck Arrays - Simple Exercises, Finding Elements
245 Given two numbers, return true if they both have the same sign. Code Completion Given two numbers, return true if they both have the same sign. CodeCheck Branches, Branches with Functions
246 Write a function that checks whether two points with coordinates x1, y1 and x2, y2 are in the same quadrant. Code Completion Write a function that checks whether two points with coordinates x1, y1 and x2, y2 are in the same quadrant. CodeCheck Branches, Branches with Functions
247 Given two numbers, return their distance if it less than 10, or 10 otherwise. Code Completion Given two numbers, return their distance if it less than 10, or 10 otherwise. CodeCheck Branches, Branches with Functions
248 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches with Functions
249 Given three numbers x, y, z and a Boolean variable <code>strict</code>, return <code>true</code> if <code>strict</code> is false and x ≤ y ≤ z, or <code>strict</code> is true and x &lt; y &lt; z. Code Completion Given three numbers x, y, z and a Boolean variable strict, return true if strict is false and x ≤... CodeCheck Branches, Branches with Functions
250 Given four numbers a, b, c, d, return true if exactly two of them are the same. Code Completion Given four numbers a, b, c, d, return true if exactly two of them are the same. CodeCheck Branches, Branches with Functions
251 Given three numbers, return true if they are evenly spaced; that is, sorted in ascending or descending order, with the same distance between them. Code Completion Given three numbers, return true if they are evenly spaced; that is, sorted in ascending or descending order, with the... CodeCheck Branches, Branches with Functions
252 Repeat for four numbers. Code Completion Repeat for four numbers. Hint: Use the previous problem. CodeCheck Branches, Branches with Functions
253 Given numbers x, y, and target, return whichever of x and y is closer to the target. Code Completion Given numbers x, y, and target, return whichever of x and y is closer to the target. If they have... CodeCheck Branches, Branches with Functions
254 Given a two-dimensional array of integers and row/column positions r, c, return the largest neighbor in the compass directions N E S W. Code Completion Given a two-dimensional array of integers and row/column positions r, c, return the largest neighbor in the compass directions N... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
255 Given a two-dimensional array of integers and row/column positions r, c, return the largest neighbor in the compass directions N E S W NE NW SE SW. Code Completion Given a two-dimensional array of integers and row/column positions r, c, return the largest neighbor in the compass directions N... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
256 Given a two-dimensional array of integers and row/column positions r, c, return the compass direction of the largest neighbor as a string N E S W NE NW SE SW. Code Completion Given a two-dimensional array of integers and row/column positions r, c, return the compass direction of the largest neighbor as... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
257 Given a two-dimensional array of integers, row/column positions r, c, and a value x, fill the given element and its neighbors in the compass directions N E S W NE NW SE SW with x. Code Completion Given a two-dimensional array of integers, row/column positions r, c, and a value x, fill the given element and its... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
258 Given a two-dimensional array a of integers and row/column positions r, c, return a 3x3 array whose middle element is a[r][c], and whose neighbors are copied from the original. Code Completion Given a two-dimensional array a of integers and row/column positions r, c, return a 3x3 array whose middle element is... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
259 Given a two-dimensional array of integers, compute the sum of all positive elements. Code Completion Given a two-dimensional array of integers, compute the sum of all positive elements. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
260 Given a two-dimensional array of integers, return the largest element in the array. Code Completion Given a two-dimensional array of integers, return the largest element in the array. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
261 Given a two-dimensional array of integers, return the position of the smallest element in the array as an array of length 2. Code Completion Given a two-dimensional array of integers, return the position of the smallest element in the array as an array of... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
262 Given a two-dimensional array of integers and a value x, return the position of the first match as an array of length 2. Code Completion Given a two-dimensional array of integers and a value x, return the position of the first match as an array... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
263 Given a two-dimensional array of integers and a value x, return the positions of all matching elements, as an array of arrays of length 2. Code Completion Given a two-dimensional array of integers and a value x, return the positions of all matching elements, as an array... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
264 Given a two-dimensional array of integers, compute the sum of all elements that are not one of the borders. Code Completion Given a two-dimensional array of integers, compute the sum of all elements that are not one of the borders. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
265 Given a two-dimensional square array of integers, compute the sum of all elements that are not on one of the diagonals. Code Completion Given a two-dimensional square array of integers, compute the sum of all elements that are not on one of the... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
266 Given a two-dimensional array of integers, replace all negative elements with zero. Code Completion Given a two-dimensional array of integers, replace all negative elements with zero. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
267 Given a two-dimensional array of integers, reverse all rows. Code Completion Given a two-dimensional array of integers, reverse all rows. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
268 Given a two-dimensional array of integers, shift each row by one to the right and put a 0 at the leftmost column. Code Completion Given a two-dimensional array of integers, shift each row by one to the right and put a 0 at the... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
269 Given an r x c array of integers, return an (r + 2) x (c + 2) array whose borders are zero and whose interior is the original array. Code Completion Given an r x c array of integers, return an (r + 2) x (c + 2) array whose borders... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
270 Given a two-dimensional array of integers, return an array of the largest element in each row. Code Completion Given a two-dimensional array of integers, return an array of the largest element in each row. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
271 Given a two-dimensional array of integers, return an array of the number of negative elements in each column. Code Completion Given a two-dimensional array of integers, return an array of the number of negative elements in each column. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
272 Given a two-dimensional array of integers and a row index, return the largest element in that row. Code Completion Given a two-dimensional array of integers and a row index, return the largest element in that row. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
273 Given a two-dimensional array of integers and a row index r, reverse the given row. Code Completion Given a two-dimensional array of integers and a row index r, reverse the given row. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
274 Given a two-dimensional square array of integers, reverse both diagonals. Code Completion Given a two-dimensional square array of integers, reverse both diagonals. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
275 Given a two-dimensional array of integers and a column index, return the smallest element in that column. Code Completion Given a two-dimensional array of integers and a column index, return the smallest element in that column. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
276 Given a two-dimensional array of integers, an index, and a string R or C, return the sum of the elements in that row or column. Code Completion Given a two-dimensional array of integers, an index, and a string R or C, return the sum of the elements... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
277 Given a two-dimensional array of integers, a row index r, and a column index c, return the sum of all elements in the given row and column. Code Completion Given a two-dimensional array of integers, a row index r, and a column index c, return the sum of all... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
278 Given a two-dimensional array of integers and a string N, E, S, W, return the sum of all elements of the border in the given compass direction. Code Completion Given a two-dimensional array of integers and a string N, E, S, W, return the sum of all elements of... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
279 Given a two-dimensional array of integers, return the sum of all elements along the north and south border. Code Completion Given a two-dimensional array of integers, return the sum of all elements along the north and south border. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
280 Given a two-dimensional array of integers, return the sum of all elements along all borders but not the corners. Code Completion Given a two-dimensional array of integers, return the sum of all elements along all borders but not the corners. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
281 Given a two-dimensional array of integers, return the sum of all elements along all borders including the corners. Code Completion Given a two-dimensional array of integers, return the sum of all elements along all borders including the corners. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
282 Given a two-dimensional square array of integers, return the sum of the elements along both diagonals. Code Completion Given a two-dimensional square array of integers, return the sum of the elements along both diagonals. Make sure not to... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
283 Given an array of integers, return the position of the first occurrence of the largest element. Code Completion Given an array of integers, return the position of the first occurrence of the largest element. CodeCheck Arrays - Simple Exercises, Maximum and Minimum
284 Given an array of integers, return the position of the last occurrence of the largest element. Code Completion Given an array of integers, return the position of the last occurrence of the largest element. CodeCheck Arrays - Simple Exercises, Maximum and Minimum
285 Given an array of integers, return the difference of the positions of the first and the last occurrence of the largest element. Code Completion Given an array of integers, return the difference of the positions of the first and the last occurrence of the... CodeCheck Arrays - Simple Exercises, Maximum and Minimum
286 Given an array of integers, return the difference between the maximum and minimum. Code Completion Given an array of integers, return the difference between the maximum and minimum. CodeCheck Arrays - Simple Exercises, Maximum and Minimum
287 Given an array of integers, swap the the maximum and minimum. Code Completion Given an array of integers, swap the the maximum and minimum. CodeCheck Arrays - Simple Exercises, Maximum and Minimum
288 Given an array of integers, return the second-largest element. Code Completion Given an array of integers, return the second-largest element. CodeCheck Arrays - Simple Exercises, Maximum and Minimum
289 Given an array of element, find the shortest distance between two consecutive elements. Code Completion Given an array of element, find the shortest distance between two consecutive elements. CodeCheck Arrays - Simple Exercises, Maximum and Minimum
290 Given an array of integers and an integer n, remove all elementts &gt; n or &lt; -n. Code Completion Given an array of integers and an integer n, remove all elementts > n or < -n. Shift all remaining... CodeCheck Arrays - Simple Exercises, Moving or Removing Elements
291 Given an array of integers, move all zeroes to the back. Code Completion Given an array of integers, move all zeroes to the back. CodeCheck Arrays - Simple Exercises, Moving or Removing Elements
292 Given an array of integers, move all zeroes to the front. Code Completion Given an array of integers, move all zeroes to the front. CodeCheck Arrays - Simple Exercises, Moving or Removing Elements
293 Given an array of integers, move all negative numbers to the front and all positive numbers to the back, keeping their relative order. Code Completion Given an array of integers, move all negative numbers to the front and all positive numbers to the back, keeping... CodeCheck Arrays - Simple Exercises, Moving or Removing Elements
294 Given an array of integers, remove all even elements that occur exactly twice. Code Completion Given an array of integers, remove all even elements that occur exactly twice. CodeCheck Arrays - Simple Exercises, Moving or Removing Elements
295 Given an array of integers, remove all adjacent duplicates. Code Completion Given an array of integers, remove all adjacent duplicates. CodeCheck Arrays - Simple Exercises, Moving or Removing Elements
296 Given a string s and an integer n, return a string in which each of the characters in s is repeated n times. Code Completion Given a string s and an integer n, return a string in which each of the characters in s is... CodeCheck Strings, Other String Operations
297 Given a string s, return the first vowel that is doubled in the string. Code Completion Given a string s, return the first vowel that is doubled in the string. CodeCheck Strings, Other String Operations
298 Given a string s, return the string with adjacent duplicates removed. Code Completion Given a string s, return the string with adjacent duplicates removed. For example, Mississippi yields Misisipi. CodeCheck Strings, Other String Operations
299 Given a string s and a string t, return a string in which all the characters of s that occur in t have been replaced by a _ sign. Code Completion Given a string s and a string t, return a string in which all the characters of s that occur... CodeCheck Strings, Other String Operations
300 Given a string, return a string composed first of all characters at even positions and then of all characters at odd positions. Code Completion Given a string, return a string composed first of all characters at even positions and then of all characters at... CodeCheck Strings, Other String Operations
301 Write a method that undoes the effect of the preceding exercise. Code Completion Write a method that undoes the effect of the preceding exercise. CodeCheck Strings, Other String Operations
302 Given a string and two characters x and y, interchange all occurrences of x and y. Code Completion Given a string and two characters x and y, interchange all occurrences of x and y. CodeCheck Strings, Other String Operations
303 Given a string s and a character c, return a string with the characters surrounding the first of c reversed. Code Completion Given a string s and a character c, return a string with the characters surrounding the first of c reversed.... CodeCheck Strings, Other String Operations
304 Given a string s and a character c, return a string with the characters surrounding any occurrence of c reversed. Code Completion Given a string s and a character c, return a string with the characters surrounding any occurrence of c reversed.... CodeCheck Strings, Other String Operations
305 Given an integer n, produce the array <pre>0 1 2 3 . Code Completion Given an integer n, produce the array 
0 1 2 3 ... n 1 2 3 4 ... 0 ......
CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
306 Given two two-dimensional arrays a and b of integers with the same number of rows and columns, return an array of the same size where each element is the greater of the corresponding elements in the two arrays. Code Completion Given two two-dimensional arrays a and b of integers with the same number of rows and columns, return an array... CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
307 Repeat the preceding exercise where the array dimensions need not match, filling positions that exist in neither array with 0. Code Completion Repeat the preceding exercise where the array dimensions need not match, filling positions that exist in neither array with 0. CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
308 Given two two-dimensional arrays of integers with the same number of rows and columns, return the first position where they do not match, as an array of length 2. Code Completion Given two two-dimensional arrays of integers with the same number of rows and columns, return the first position where they... CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
309 Given two two-dimensional arrays with the same number of rows, return an array that places them side by side. Code Completion Given two two-dimensional arrays with the same number of rows, return an array that places them side by side. CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
310 Repeat where the row lengths don't have to match. Code Completion Repeat where the row lengths don't have to match. Fill the shorter array with zeroes. CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
311 Given a two-dimensional array a, return an array whose [i][j] element is the average of the neighbors of a[i][j] in the N, E, S, W direction. Code Completion Given a two-dimensional array a, return an array whose [i][j] element is the average of the neighbors of a[i][j] in... CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
312 Given two strings s and t, return the first position where their characters differ, or -1 if they are identical. Code Completion Given two strings s and t, return the first position where their characters differ, or -1 if they are identical. CodeCheck Strings, Comparing Strings
313 Given two strings s and t, return the first position where their characters are the same, or -1 if there is no such position. Code Completion Given two strings s and t, return the first position where their characters are the same, or -1 if there... CodeCheck Strings, Comparing Strings
314 Given a string s, count how many times the ith character from the front equals the ith character from the back. Code Completion Given a string s, count how many times the ith character from the front equals the ith character from the... CodeCheck Strings, Comparing Strings
315 Given strings s and t, return a list of all positions in which t occurs in s. Code Completion Given strings s and t, return a list of all positions in which t occurs in s. CodeCheck Strings, Finding Substrings
316 Given strings s and t, return a string in which all occurrences of t are removed from s. Code Completion Given strings s and t, return a string in which all occurrences of t are removed from s. CodeCheck Strings, Finding Substrings
317 Given strings s and t, return a string in which all characters in t are removed from s. Code Completion Given strings s and t, return a string in which all characters in t are removed from s. CodeCheck Strings, Finding Substrings
318 Given a string s, return the longest prefix that is repeated somewhere else in the string. Code Completion Given a string s, return the longest prefix that is repeated somewhere else in the string. CodeCheck Strings, Finding Substrings
319 Given a string s, find the longest prefix that also occurs at the end (so that s = p + t + p), and return t, the string without the beginning and the end. Code Completion Given a string s, find the longest prefix that also occurs at the end (so that s = p +... CodeCheck Strings, Finding Substrings
320 Given a string, return the string with the first and last characters swapped. Code Completion Given a string, return the string with the first and last characters swapped. CodeCheck Strings, No Loops
321 Given a string, return the string with the middle two characters removed if it has even length, and the middle character removed if it has odd length. Code Completion Given a string, return the string with the middle two characters removed if it has even length, and the middle... CodeCheck Strings, No Loops
322 Given a string, return the string with the middle two characters swapped if it has even length, and the middle three characters swapped if it has odd length. Code Completion Given a string, return the string with the middle two characters swapped if it has even length, and the middle... CodeCheck Strings, No Loops
323 Given a string, return the string with the first and second half swapped. Code Completion Given a string, return the string with the first and second half swapped. If the string has odd length, leave... CodeCheck Strings, No Loops
324 Given a string, return the string with the first half and the second half doubled. Code Completion Given a string, return the string with the first half and the second half doubled. For example, Java becomes JaJavava... CodeCheck Strings, No Loops
325 Given a string, find the first integer inside and return its value as an integer. Code Completion Given a string, find the first integer inside and return its value as an integer. Return 0 if there is... CodeCheck Strings, Numbers in Strings
326 Given a string, find the sum of all integers inside. Code Completion Given a string, find the sum of all integers inside. Return 0 if there is no integer inside. CodeCheck Strings, Numbers in Strings
327 Given a string, find all integers inside and return a string that separates them by commas. Code Completion Given a string, find all integers inside and return a string that separates them by commas. CodeCheck Strings, Numbers in Strings
328 Given a string in which words are separated by spaces, return the longest word. Code Completion Given a string in which words are separated by spaces, return the longest word. CodeCheck Strings, Words
329 Given a string in which words are separated by spaces, return the first word that is duplicated (such as an accidental “this this”). Code Completion Given a string in which words are separated by spaces, return the first word that is duplicated (such as an... CodeCheck Strings, Words
330 Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the string. Code Completion Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the... CodeCheck Strings, Words
331 Given a string in which words are separated by spaces, and two words a and b, interchange all occurrences of a and b. Code Completion Given a string in which words are separated by spaces, and two words a and b, interchange all occurrences of... CodeCheck Strings, Words
332 Given an array of integers, return the sum of all positive elements. Code Completion Given an array of integers, return the sum of all positive elements. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
333 Given an array of integers, find the largest sum of two different elements in the array. Code Completion Given an array of integers, find the largest sum of two different elements in the array. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
334 Given an array of floating-point numbers, return an array of the averages of consecutive element pairs of the original array. Code Completion Given an array of floating-point numbers, return an array of the averages of consecutive element pairs of the original array. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
335 Given an array of integers and an integer n, return an array of the averages of n consecutive elements of the original array. Code Completion Given an array of integers and an integer n, return an array of the averages of n consecutive elements of... CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
336 Given an array of integers, return the average of all elements that are not the maximum or minimum. Code Completion Given an array of integers, return the average of all elements that are not the maximum or minimum. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
337 Given an array of integers, replace each element with the average of its neighbors. Code Completion Given an array of integers, replace each element with the average of its neighbors. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
338 Given an array of integers, return the sum of all odd elements. Code Completion Given an array of integers, return the sum of all odd elements. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
339 Given an array of integers and two values a and b, return the sum of all elements that are at least a and at most b. Code Completion Given an array of integers and two values a and b, return the sum of all elements that are at... CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
340 Given an array of integers, return the average of all positive elements. Code Completion Given an array of integers, return the average of all positive elements. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
341 Given an array of strings and a string s, return the average length of all strings containing s. Code Completion Given an array of strings and a string s, return the average length of all strings containing s. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
342 Given an array of integers, return the product of all non-zero elements. Code Completion Given an array of integers, return the product of all non-zero elements. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
343 Given an array of integers, give the smallest n so that the sum of the first n elements is at least as large as the sum of the remaining elements. Code Completion Given an array of integers, give the smallest n so that the sum of the first n elements is at... CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
344 Given an array of integers, give the largest n ≤ length / 2 so that the sum of the first n elements equals the sum of the last n elements. Code Completion Given an array of integers, give the largest n ≤ length / 2 so that the sum of the first... CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
345 Given an array of integers, give the largest sum of n consecutive elements. Code Completion Given an array of integers, give the largest sum of n consecutive elements. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
346 Given an array of integers, return an array of length 2 containing the first and last element, in sorted order. Code Completion Given an array of integers, return an array of length 2 containing the first and last element, in sorted order. CodeCheck Arrays - Simple Exercises, Two Answers
347 Given an array of integers, return an array of length 2 containing the minimum and the maximum. Code Completion Given an array of integers, return an array of length 2 containing the minimum and the maximum. CodeCheck Arrays - Simple Exercises, Two Answers
348 Given an array of integers, return an array of length 2, with the number of positive and the number of negative elements in the array. Code Completion Given an array of integers, return an array of length 2, with the number of positive and the number of... CodeCheck Arrays - Simple Exercises, Two Answers
349 Given an array of integers, return an array of length 2, each being an array. Code Completion Given an array of integers, return an array of length 2, each being an array. The first one holds the... CodeCheck Arrays - Simple Exercises, Two Answers
350 Given an array of integers, return an array of length 2, each being an array. Code Completion Given an array of integers, return an array of length 2, each being an array. The first one holds the... CodeCheck Arrays - Simple Exercises, Two Answers
351 Given a two-dimensional array of integers, return the average of the four corner elements. Code Completion Given a two-dimensional array of integers, return the average of the four corner elements. CodeCheck Two-Dimensional Arrays, No Loops
352 Given a two-dimensional array of integers, return the middle element if both the row and column lenghts are odd, or the average of the two or four middle elements of one or both is even. Code Completion Given a two-dimensional array of integers, return the middle element if both the row and column lenghts are odd, or... CodeCheck Two-Dimensional Arrays, No Loops
353 Given a two-dimensional array of integers and a string N, E, S, W, give the middle element along the border in the given compass direction, or the average of the two middle ones if the border length is even. Code Completion Given a two-dimensional array of integers and a string N, E, S, W, give the middle element along the border... CodeCheck Two-Dimensional Arrays, No Loops
354 Given a two-dimensional array of integers and a string NW, NW, SW, SE, return the sum of the four elements in the given compass direction. Code Completion Given a two-dimensional array of integers and a string NW, NW, SW, SE, return the sum of the four elements... CodeCheck Two-Dimensional Arrays, No Loops
355 Given a two-dimensional array of integers, row/column indexes r, c, and a string N E S W, return the neighbor in that direction, or 0 if it doesn't exist. Code Completion Given a two-dimensional array of integers, row/column indexes r, c, and a string N E S W, return the neighbor... CodeCheck Two-Dimensional Arrays, No Loops
356 Repeat with NW NE SW SE. Code Completion Repeat with NW NE SW SE. CodeCheck Two-Dimensional Arrays, No Loops
357 Given a two-dimensional array of integers and row/column indexes r, c, return the number of neighbors (not counting the element itself). Code Completion Given a two-dimensional array of integers and row/column indexes r, c, return the number of neighbors (not counting the element... CodeCheck Two-Dimensional Arrays, No Loops
358 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Two-Dimensional Arrays, No Loops
359 Given a list of integers of length ≥ 4, return the average of the first two and last two elements. Code Completion Given a list of integers of length ≥ 4, return the average of the first two and last two elements. CodeCheck Lists - Simple Exercises, No loops
360 Given a list of integers of length ≥ 3, return the average of the first, last, and middle element (or the two middle elements if the length is even). Code Completion Given a list of integers of length ≥ 3, return the average of the first, last, and middle element (or... CodeCheck Lists - Simple Exercises, No loops
361 Given a list of integers, swap the first and last elements. Code Completion Given a list of integers, swap the first and last elements. CodeCheck Lists - Simple Exercises, No loops
362 Given a list of integers, swap the first two and the last two elements. Code Completion Given a list of integers, swap the first two and the last two elements. CodeCheck Lists - Simple Exercises, No loops
363 Given an input string, print the string with the first and last letter removed if they were equal, or the original string if they were not. Code Completion Given an input string, print the string with the first and last letter removed if they were equal, or the... CodeCheck Branches, Branches Without Functions
364 Given an actual time and an alarm clock time, both in “military” format (such as 0730 for 7:30am), print how many more minutes before the alarm rings. Code Completion Given an actual time and an alarm clock time, both in “military” format (such as 0730 for 7:30am), print how... CodeCheck Branches, Branches Without Functions
365 Repeat the preceding exercise for U. Code Completion Repeat the preceding exercise for U.S. time (e.g. 7:30am). CodeCheck Branches, Branches Without Functions
366 Given a point with integer coordinates (x, y) and a compass direction N, E, S, W, print the neigboring lattice point. Code Completion Given a point with integer coordinates (x, y) and a compass direction N, E, S, W, print the neigboring lattice... CodeCheck Branches, Branches Without Functions
367 Repeat with compass directions NW, NE, SW, SE. Code Completion Repeat with compass directions NW, NE, SW, SE. CodeCheck Branches, Branches Without Functions
368 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches Without Functions
369 On a chessboard, fields are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, fields are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches Without Functions
370 Given the x- and y-coordinates of a point, print whether the point lies in the first, second, third, or fourth quadrant plane, or on the x-axis, or on the y-axis, or the origin. Code Completion Given the x- and y-coordinates of a point, print whether the point lies in the first, second, third, or fourth... CodeCheck Branches, Branches Without Functions
371 Given three numbers x, y, z, determine if one of them is the sum of the two others, and then print out the equation. Code Completion Given three numbers x, y, z, determine if one of them is the sum of the two others, and then... CodeCheck Branches, Branches Without Functions
372 Given three numbers x, y, z, print out how whether they are all distinct, two are the same, or all three are the same. Code Completion Given three numbers x, y, z, print out how whether they are all distinct, two are the same, or all... CodeCheck Branches, Branches Without Functions
373 Given two integers x and y, print their sum, but if it is more than 100 or less than 0, print "out of range". Code Completion Given two integers x and y, print their sum, but if it is more than 100 or less than 0,... CodeCheck Branches, Branches Without Functions
374 Given three integers x, y, z, print the sum of the odd integers. Code Completion Given three integers x, y, z, print the sum of the odd integers. CodeCheck Branches, Branches Without Functions
375 Given three input strings, print all but the shortest one. Code Completion Given three input strings, print all but the shortest one. CodeCheck Branches, Branches Without Functions
376 Given a two-dimensional array of integers, return the number of distinct elements. Code Completion Given a two-dimensional array of integers, return the number of distinct elements. CodeCheck Two-Dimensional Arrays, Complex Loops
377 Given a two-dimensional array of integers, remove any adjacent duplicate rows by filling the duplicates with zeroes. Code Completion Given a two-dimensional array of integers, remove any adjacent duplicate rows by filling the duplicates with zeroes. CodeCheck Two-Dimensional Arrays, Complex Loops
378 Given a two-dimensional array of integers, return the index of the first row that is entirely filled with zeroes. Code Completion Given a two-dimensional array of integers, return the index of the first row that is entirely filled with zeroes. CodeCheck Two-Dimensional Arrays, Complex Loops
379 Given a two-dimensional array of integers, return the top left corner of the first subarray of the form <pre>0 0 0 0</pre> Code Completion Given a two-dimensional array of integers, return the top left corner of the first subarray of the form 
0 0...
CodeCheck Two-Dimensional Arrays, Complex Loops
380 Given a two-dimensional array of integers, return the position of the largest square subarray filled with zeroes, as a list of length 2. Code Completion Given a two-dimensional array of integers, return the position of the largest square subarray filled with zeroes, as a list... CodeCheck Two-Dimensional Arrays, Complex Loops
381 Repeat the previous exercise with subarrays that are not necessarily square. Code Completion Repeat the previous exercise with subarrays that are not necessarily square. CodeCheck Two-Dimensional Arrays, Complex Loops
382 Given a list of integers, count how many elements are negative. Code Completion Given a list of integers, count how many elements are negative. CodeCheck Lists - Simple Exercises, Counting Elements
383 Given a list a, count how many times the ith element from the front equals the ith element from the back. Code Completion Given a list a, count how many times the ith element from the front equals the ith element from the... CodeCheck Lists - Simple Exercises, Counting Elements
384 Given a list of integers and two values a and b, count how many elements are at least a and at most b. Code Completion Given a list of integers and two values a and b, count how many elements are at least a and... CodeCheck Lists - Simple Exercises, Counting Elements
385 Given a list of integers, return the most frequent element. Code Completion Given a list of integers, return the most frequent element. If there is more than one element with maximum frequency,... CodeCheck Lists - Simple Exercises, Counting Elements
386 Given a list of integers, return a list of all elements that occur with maximum frequency. Code Completion Given a list of integers, return a list of all elements that occur with maximum frequency. CodeCheck Lists - Simple Exercises, Counting Elements
387 Given a list of integers, return the position of the first element that occurs more than once, or -1 if all elements occur exactly once. Code Completion Given a list of integers, return the position of the first element that occurs more than once, or -1 if... CodeCheck Lists - Simple Exercises, Counting Elements
388 Given a list of integers, return a list of all elements that occur exactly once. Code Completion Given a list of integers, return a list of all elements that occur exactly once. CodeCheck Lists - Simple Exercises, Counting Elements
389 Given a list of integers, remove all elements that occur more than once, leaving the first occurrence. Code Completion Given a list of integers, remove all elements that occur more than once, leaving the first occurrence. CodeCheck Lists - Simple Exercises, Counting Elements
390 Given two lists of integers a and b of the same length, count the number of positions where the lists have the same elements. Code Completion Given two lists of integers a and b of the same length, count the number of positions where the lists... CodeCheck Lists - Simple Exercises, Counting Elements
391 Given two lists of integers a and b of the same length, count the number of positions where the list elements differ by at least 2. Code Completion Given two lists of integers a and b of the same length, count the number of positions where the list... CodeCheck Lists - Simple Exercises, Counting Elements
392 Given two lists a and b, remove all elements of b from a. Code Completion Given two lists a and b, remove all elements of b from a. CodeCheck Lists - Simple Exercises, Double Loops
393 Given two lists a and b, return a list that contains all elements occurring in a but not in b. Code Completion Given two lists a and b, return a list that contains all elements occurring in a but not in b. CodeCheck Lists - Simple Exercises, Double Loops
394 Given a list a, return the longest n so that the first n elements equal the last n elements. Code Completion Given a list a, return the longest n so that the first n elements equal the last n elements. CodeCheck Lists - Simple Exercises, Double Loops
395 Given a list of integers, return the largest sum of consecutive elements. Code Completion Given a list of integers, return the largest sum of consecutive elements. CodeCheck Lists - Simple Exercises, Double Loops
396 Given a list of integers, return the largest sequence whose reverse also occurs somewhere in the list. Code Completion Given a list of integers, return the largest sequence whose reverse also occurs somewhere in the list. CodeCheck Lists - Simple Exercises, Double Loops
397 Given a list a of integers, return a list of all elements of a that occur exactly once. Code Completion Given a list a of integers, return a list of all elements of a that occur exactly once. CodeCheck Lists - Simple Exercises, Double Loops
398 Given a list of integers, return a list of lists of length 2, containing each unique element together with its frequency. Code Completion Given a list of integers, return a list of lists of length 2, containing each unique element together with its... CodeCheck Lists - Simple Exercises, Double Loops
399 Given a list of integers, return the position of the longest subsequence of consecutive integers a, a + 1, a + 2, . Code Completion Given a list of integers, return the position of the longest subsequence of consecutive integers a, a + 1, a... CodeCheck Lists - Simple Exercises, Double Loops
400 Given an integer n, return a list of length n containing 1 -1 1 -1 . Code Completion Given an integer n, return a list of length n containing 1 -1 1 -1 ... CodeCheck Lists - Simple Exercises, Filling
401 Given integers n and k, return a list of length n containing 0 1 2 . Code Completion Given integers n and k, return a list of length n containing 0 1 2 ... k-1 0 1 2... CodeCheck Lists - Simple Exercises, Filling
402 Given integers a and b, return a list containing a, a + 1, a + 2, . Code Completion Given integers a and b, return a list containing a, a + 1, a + 2, ..., b. CodeCheck Lists - Simple Exercises, Filling
403 Given integers a and b, return a list containing all even numbers that are at least a and at most b. Code Completion Given integers a and b, return a list containing all even numbers that are at least a and at most... CodeCheck Lists - Simple Exercises, Filling
404 Given an integer n, return a list containing 1 2 2 3 3 3 4 4 4 4 . Code Completion Given an integer n, return a list containing 1 2 2 3 3 3 4 4 4 4 ... and... CodeCheck Lists - Simple Exercises, Filling
405 Given a list of integers and a value, return the position of the last occurrence of the value in the list, or -1 if the value does not exist. Code Completion Given a list of integers and a value, return the position of the last occurrence of the value in the... CodeCheck Lists - Simple Exercises, Finding Elements
406 Given a list of integers and a value, return the difference between the last and first position of the value in the list, or -1 if the value does not exist. Code Completion Given a list of integers and a value, return the difference between the last and first position of the value... CodeCheck Lists - Simple Exercises, Finding Elements
407 Given a list of integers and a value, return a list of all positions of the value in the list. Code Completion Given a list of integers and a value, return a list of all positions of the value in the list. CodeCheck Lists - Simple Exercises, Finding Elements
408 Given a list of integers and a value, return the position of the element that is closest to the value. Code Completion Given a list of integers and a value, return the position of the element that is closest to the value.... CodeCheck Lists - Simple Exercises, Finding Elements
409 Given two lists of integers of the same length, return the first position where their elements are the same. Code Completion Given two lists of integers of the same length, return the first position where their elements are the same. CodeCheck Lists - Simple Exercises, Finding Elements
410 Given two lists of integers of the same length, return the first position where their elements differ. Code Completion Given two lists of integers of the same length, return the first position where their elements differ. CodeCheck Lists - Simple Exercises, Finding Elements
411 Given two numbers, return true if they both have the same sign. Code Completion Given two numbers, return true if they both have the same sign. CodeCheck Branches, Branches with Functions
412 Write a function that checks whether two points with coordinates x1, y1 and x2, y2 are in the same quadrant. Code Completion Write a function that checks whether two points with coordinates x1, y1 and x2, y2 are in the same quadrant. CodeCheck Branches, Branches with Functions
413 Given two numbers, return their distance if it less than 10, or 10 otherwise. Code Completion Given two numbers, return their distance if it less than 10, or 10 otherwise. CodeCheck Branches, Branches with Functions
414 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches with Functions
415 Given three numbers x, y, z and a Boolean variable <code>strict</code>, return <code>true</code> if <code>strict</code> is false and x ≤ y ≤ z, or <code>strict</code> is true and x &lt; y &lt; z. Code Completion Given three numbers x, y, z and a Boolean variable strict, return true if strict is false and x ≤... CodeCheck Branches, Branches with Functions
416 Given four numbers a, b, c, d, return true if exactly two of them are the same. Code Completion Given four numbers a, b, c, d, return true if exactly two of them are the same. CodeCheck Branches, Branches with Functions
417 Given three numbers, return true if they are evenly spaced; that is, sorted in ascending or descending order, with the same distance between them. Code Completion Given three numbers, return true if they are evenly spaced; that is, sorted in ascending or descending order, with the... CodeCheck Branches, Branches with Functions
418 Repeat for four numbers. Code Completion Repeat for four numbers. Hint: Use the previous problem. CodeCheck Branches, Branches with Functions
419 Given numbers x, y, and target, return whichever of x and y is closer to the target. Code Completion Given numbers x, y, and target, return whichever of x and y is closer to the target. If they have... CodeCheck Branches, Branches with Functions
420 Given a two-dimensional array of integers and row/column positions r, c, return the largest neighbor in the compass directions N E S W. Code Completion Given a two-dimensional array of integers and row/column positions r, c, return the largest neighbor in the compass directions N... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
421 Given a two-dimensional array of integers and row/column positions r, c, return the largest neighbor in the compass directions N E S W NE NW SE SW. Code Completion Given a two-dimensional array of integers and row/column positions r, c, return the largest neighbor in the compass directions N... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
422 Given a two-dimensional array of integers and row/column positions r, c, return the compass direction of the largest neighbor as a string N E S W NE NW SE SW. Code Completion Given a two-dimensional array of integers and row/column positions r, c, return the compass direction of the largest neighbor as... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
423 Given a two-dimensional array of integers, row/column positions r, c, and a value x, fill the given element and its neighbors in the compass directions N E S W NE NW SE SW with x. Code Completion Given a two-dimensional array of integers, row/column positions r, c, and a value x, fill the given element and its... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
424 Given a two-dimensional array a of integers and row/column positions r, c, return a 3x3 array whose middle element is a[r][c], and whose neighbors are copied from the original. Code Completion Given a two-dimensional array a of integers and row/column positions r, c, return a 3x3 array whose middle element is... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
425 Given a two-dimensional array of integers, compute the sum of all positive elements. Code Completion Given a two-dimensional array of integers, compute the sum of all positive elements. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
426 Given a two-dimensional array of integers, return the largest element in the array. Code Completion Given a two-dimensional array of integers, return the largest element in the array. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
427 Given a two-dimensional array of integers, return the position of the smallest element in the array as a list of length 2. Code Completion Given a two-dimensional array of integers, return the position of the smallest element in the array as a list of... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
428 Given a two-dimensional array of integers and a value x, return the position of the first match as a list of length 2. Code Completion Given a two-dimensional array of integers and a value x, return the position of the first match as a list... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
429 Given a two-dimensional array of integers and a value x, return the positions of all matching elements, as a list of arrays of length 2. Code Completion Given a two-dimensional array of integers and a value x, return the positions of all matching elements, as a list... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
430 Given a two-dimensional array of integers, compute the sum of all elements that are not one of the borders. Code Completion Given a two-dimensional array of integers, compute the sum of all elements that are not one of the borders. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
431 Given a two-dimensional square array of integers, compute the sum of all elements that are not on one of the diagonals. Code Completion Given a two-dimensional square array of integers, compute the sum of all elements that are not on one of the... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
432 Given a two-dimensional array of integers, replace all negative elements with zero. Code Completion Given a two-dimensional array of integers, replace all negative elements with zero. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
433 Given a two-dimensional array of integers, reverse all rows. Code Completion Given a two-dimensional array of integers, reverse all rows. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
434 Given a two-dimensional array of integers, shift each row by one to the right and put a 0 at the leftmost column. Code Completion Given a two-dimensional array of integers, shift each row by one to the right and put a 0 at the... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
435 Given an r x c array of integers, return an (r + 2) x (c + 2) array whose borders are zero and whose interior is the original array. Code Completion Given an r x c array of integers, return an (r + 2) x (c + 2) array whose borders... CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
436 Given a two-dimensional array of integers, return a list of the largest element in each row. Code Completion Given a two-dimensional array of integers, return a list of the largest element in each row. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
437 Given a two-dimensional array of integers, return a list of the number of negative elements in each row. Code Completion Given a two-dimensional array of integers, return a list of the number of negative elements in each row. CodeCheck Two-Dimensional Arrays, Looping Over the Entire Array
438 Given a two-dimensional array of integers and a row index, return the largest element in that row. Code Completion Given a two-dimensional array of integers and a row index, return the largest element in that row. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
439 Given a two-dimensional array of integers and a row index r, reverse the given row. Code Completion Given a two-dimensional array of integers and a row index r, reverse the given row. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
440 Given a two-dimensional square array of integers, reverse both diagonals. Code Completion Given a two-dimensional square array of integers, reverse both diagonals. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
441 Given a two-dimensional array of integers and a column index, return the smallest element in that column. Code Completion Given a two-dimensional array of integers and a column index, return the smallest element in that column. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
442 Given a two-dimensional array of integers, an index, and a string R or C, return the sum of the elements in that row or column. Code Completion Given a two-dimensional array of integers, an index, and a string R or C, return the sum of the elements... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
443 Given a two-dimensional array of integers, a row index r, and a column index c, return the sum of all elements in the given row and column. Code Completion Given a two-dimensional array of integers, a row index r, and a column index c, return the sum of all... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
444 Given a two-dimensional array of integers and a string N, E, S, W, return the sum of all elements of the border in the given compass direction. Code Completion Given a two-dimensional array of integers and a string N, E, S, W, return the sum of all elements of... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
445 Given a two-dimensional array of integers, return the sum of all elements along the north and south border. Code Completion Given a two-dimensional array of integers, return the sum of all elements along the north and south border. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
446 Given a two-dimensional array of integers, return the sum of all elements along all borders but not the corners. Code Completion Given a two-dimensional array of integers, return the sum of all elements along all borders but not the corners. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
447 Given a two-dimensional array of integers, return the sum of all elements along all borders including the corners. Code Completion Given a two-dimensional array of integers, return the sum of all elements along all borders including the corners. CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
448 Given a two-dimensional square array of integers, return the sum of the elements along both diagonals. Code Completion Given a two-dimensional square array of integers, return the sum of the elements along both diagonals. Make sure not to... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
449 Given a list of integers, return the position of the first occurrence of the largest element. Code Completion Given a list of integers, return the position of the first occurrence of the largest element. CodeCheck Lists - Simple Exercises, Maximum and Minimum
450 Given a list of integers, return the position of the last occurrence of the largest element. Code Completion Given a list of integers, return the position of the last occurrence of the largest element. CodeCheck Lists - Simple Exercises, Maximum and Minimum
451 Given a list of integers, return the difference of the positions of the first and the last occurrence of the largest element. Code Completion Given a list of integers, return the difference of the positions of the first and the last occurrence of the... CodeCheck Lists - Simple Exercises, Maximum and Minimum
452 Given a list of integers, return the difference between the maximum and minimum. Code Completion Given a list of integers, return the difference between the maximum and minimum. CodeCheck Lists - Simple Exercises, Maximum and Minimum
453 Given a list of integers, swap the the maximum and minimum. Code Completion Given a list of integers, swap the the maximum and minimum. CodeCheck Lists - Simple Exercises, Maximum and Minimum
454 Given a list of integers, return the second-largest element. Code Completion Given a list of integers, return the second-largest element. CodeCheck Lists - Simple Exercises, Maximum and Minimum
455 Given a list of elements, find the shortest distance between two consecutive elements. Code Completion Given a list of elements, find the shortest distance between two consecutive elements. CodeCheck Lists - Simple Exercises, Maximum and Minimum
456 Given a list of integers and an integer n, remove all elementts &gt; n or &lt; -n. Code Completion Given a list of integers and an integer n, remove all elementts > n or < -n. Shift all remaining... CodeCheck Lists - Simple Exercises, Moving or Removing Elements
457 Given a list of integers, move all zeroes to the back. Code Completion Given a list of integers, move all zeroes to the back. CodeCheck Lists - Simple Exercises, Moving or Removing Elements
458 Given a list of integers, move all zeroes to the front. Code Completion Given a list of integers, move all zeroes to the front. CodeCheck Lists - Simple Exercises, Moving or Removing Elements
459 Given a list of integers, move all negative numbers to the front and all positive numbers to the back, keeping their relative order. Code Completion Given a list of integers, move all negative numbers to the front and all positive numbers to the back, keeping... CodeCheck Lists - Simple Exercises, Moving or Removing Elements
460 Given a list of integers, remove all even elements that occur exactly twice. Code Completion Given a list of integers, remove all even elements that occur exactly twice. CodeCheck Lists - Simple Exercises, Moving or Removing Elements
461 Given a list of integers, remove all adjacent duplicates. Code Completion Given a list of integers, remove all adjacent duplicates. CodeCheck Lists - Simple Exercises, Moving or Removing Elements
462 Given a string s and an integer n, return a string in which each of the characters in s is repeated n times. Code Completion Given a string s and an integer n, return a string in which each of the characters in s is... CodeCheck Strings, Other String Operations
463 Given a string s, return the first vowel that is doubled in the string. Code Completion Given a string s, return the first vowel that is doubled in the string. CodeCheck Strings, Other String Operations
464 Given a string s, return the string with adjacent duplicates removed. Code Completion Given a string s, return the string with adjacent duplicates removed. For example, Mississippi yields Misisipi. CodeCheck Strings, Other String Operations
465 Given a string s and a string t, return a string in which all the characters of s that occur in t have been replaced by a _ character. Code Completion Given a string s and a string t, return a string in which all the characters of s that occur... CodeCheck Strings, Other String Operations
466 Given a string, return a string composed first of all characters at even positions and then of all characters at odd positions. Code Completion Given a string, return a string composed first of all characters at even positions and then of all characters at... CodeCheck Strings, Other String Operations
467 Write a method that undoes the effect of the preceding exercise. Code Completion Write a method that undoes the effect of the preceding exercise. CodeCheck Strings, Other String Operations
468 Given a string and two characters x and y (as strings of length 1), interchange all occurrences of x and y. Code Completion Given a string and two characters x and y (as strings of length 1), interchange all occurrences of x and... CodeCheck Strings, Other String Operations
469 Given a string s and a character c (as string of length 1), return a string with the characters surrounding the first occurrence of c reversed. Code Completion Given a string s and a character c (as string of length 1), return a string with the characters surrounding... CodeCheck Strings, Other String Operations
470 Given a string s and a character c (as string of length 1), return a string with the characters surrounding any occurrence of c reversed. Code Completion Given a string s and a character c (as string of length 1), return a string with the characters surrounding... CodeCheck Strings, Other String Operations
471 Given an integer n, produce the array <pre>0 1 2 3 . Code Completion Given an integer n, produce the array 
0 1 2 3 ... n 1 2 3 4 ... 0 ......
CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
472 Given two two-dimensional arrays a and b of integers with the same number of rows and columns, return a list of the same size where each element is the greater of the corresponding elements in the two arrays. Code Completion Given two two-dimensional arrays a and b of integers with the same number of rows and columns, return a list... CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
473 Repeat the preceding exercise where the array dimensions need not match, filling positions that exist in neither array with 0. Code Completion Repeat the preceding exercise where the array dimensions need not match, filling positions that exist in neither array with 0. CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
474 Given two two-dimensional arrays of integers with the same number of rows and columns, return the first position where they do not match, as a list of length 2. Code Completion Given two two-dimensional arrays of integers with the same number of rows and columns, return the first position where they... CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
475 Given two two-dimensional arrays with the same number of rows, return a list that places them side by side. Code Completion Given two two-dimensional arrays with the same number of rows, return a list that places them side by side. CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
476 Repeat where the row lengths don't have to match. Code Completion Repeat where the row lengths don't have to match. Fill the shorter array with zeroes. CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
477 Given a two-dimensional array a, return a list whose [i][j] element is the average of the neighbors of a[i][j] in the N, E, S, W direction. Code Completion Given a two-dimensional array a, return a list whose [i][j] element is the average of the neighbors of a[i][j] in... CodeCheck Two-Dimensional Arrays, Producing 2D Arrays
478 Given two strings s and t, return the first position where their characters differ, or -1 if they are identical. Code Completion Given two strings s and t, return the first position where their characters differ, or -1 if they are identical. CodeCheck Strings, Comparing Strings
479 Given two strings s and t, return the first position where their characters are the same, or -1 if there is no such position. Code Completion Given two strings s and t, return the first position where their characters are the same, or -1 if there... CodeCheck Strings, Comparing Strings
480 Given a string s, count how many times the ith character from the front equals the ith character from the back. Code Completion Given a string s, count how many times the ith character from the front equals the ith character from the... CodeCheck Strings, Comparing Strings
481 Given strings s and t, return a list of all positions in which t occurs in s. Code Completion Given strings s and t, return a list of all positions in which t occurs in s. CodeCheck Strings, Finding Substrings
482 Given strings s and t, return a string in which all occurrences of t are removed from s. Code Completion Given strings s and t, return a string in which all occurrences of t are removed from s. CodeCheck Strings, Finding Substrings
483 Given strings s and t, return a string in which all characters in t are removed from s. Code Completion Given strings s and t, return a string in which all characters in t are removed from s. CodeCheck Strings, Finding Substrings
484 Given a string s, return the longest prefix that is repeated somewhere else in the string. Code Completion Given a string s, return the longest prefix that is repeated somewhere else in the string. CodeCheck Strings, Finding Substrings
485 Given a string s, find the longest prefix that also occurs at the end (so that s = p + t + p), and return t, the string without the beginning and the end. Code Completion Given a string s, find the longest prefix that also occurs at the end (so that s = p +... CodeCheck Strings, Finding Substrings
486 Given a string, return the string with the first and last characters swapped. Code Completion Given a string, return the string with the first and last characters swapped. CodeCheck Strings, No Loops
487 Given a string, return the string with the middle two characters removed if it has even length, and the middle character removed if it has odd length. Code Completion Given a string, return the string with the middle two characters removed if it has even length, and the middle... CodeCheck Strings, No Loops
488 Given a string, return the string with the middle two characters swapped if it has even length, and the middle three characters swapped if it has odd length. Code Completion Given a string, return the string with the middle two characters swapped if it has even length, and the middle... CodeCheck Strings, No Loops
489 Given a string, return the string with the first and second half swapped. Code Completion Given a string, return the string with the first and second half swapped. If the string has odd length, leave... CodeCheck Strings, No Loops
490 Given a string, return the string with the first half and the second half doubled. Code Completion Given a string, return the string with the first half and the second half doubled. For example, Java becomes JaJavava... CodeCheck Strings, No Loops
491 Given a string, find the first integer inside and return its value as an integer. Code Completion Given a string, find the first integer inside and return its value as an integer. Return 0 if there is... CodeCheck Strings, Numbers in Strings
492 Given a string, find the sum of all integers inside. Code Completion Given a string, find the sum of all integers inside. Return 0 if there is no integer inside. CodeCheck Strings, Numbers in Strings
493 Given a string, find all integers inside and return a string that separates them by commas. Code Completion Given a string, find all integers inside and return a string that separates them by commas. CodeCheck Strings, Numbers in Strings
494 Given a string in which words are separated by spaces, return the longest word. Code Completion Given a string in which words are separated by spaces, return the longest word. CodeCheck Strings, Words
495 Given a string in which words are separated by spaces, return the first word that is duplicated (such as an accidental “this this”. Code Completion Given a string in which words are separated by spaces, return the first word that is duplicated (such as an... CodeCheck Strings, Words
496 Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the string. Code Completion Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the... CodeCheck Strings, Words
497 Given a string in which words are separated by spaces, and two words a and b, interchange all occurrences of a and b. Code Completion Given a string in which words are separated by spaces, and two words a and b, interchange all occurrences of... CodeCheck Strings, Words
498 Given a list of integers, return the sum of all positive elements. Code Completion Given a list of integers, return the sum of all positive elements. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
499 Given a list of integers, find the largest sum of two different elements in the list. Code Completion Given a list of integers, find the largest sum of two different elements in the list. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
500 Given a list of floating-point numbers, return a list of the averages of consecutive element pairs of the original list. Code Completion Given a list of floating-point numbers, return a list of the averages of consecutive element pairs of the original list. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
501 Given a list of integers and an integer n, return a list of the averages of n consecutive elements of the original list. Code Completion Given a list of integers and an integer n, return a list of the averages of n consecutive elements of... CodeCheck Lists - Simple Exercises, Sums, Averages, Products
502 Given a list of integers, return the average of all elements that are not the maximum or minimum. Code Completion Given a list of integers, return the average of all elements that are not the maximum or minimum. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
503 Given a list of integers, replace each element with the average of its neighbors. Code Completion Given a list of integers, replace each element with the average of its neighbors. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
504 Given a list of integers, return the sum of all odd elements. Code Completion Given a list of integers, return the sum of all odd elements. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
505 Given a list of integers and two values a and b, return the sum of all elements that are at least a and at most b. Code Completion Given a list of integers and two values a and b, return the sum of all elements that are at... CodeCheck Lists - Simple Exercises, Sums, Averages, Products
506 Given a list of integers, return the average of all positive elements. Code Completion Given a list of integers, return the average of all positive elements. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
507 Given a list of strings and a string s, return the average length of all strings containing s. Code Completion Given a list of strings and a string s, return the average length of all strings containing s. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
508 Given a list of integers, return the product of all non-zero elements. Code Completion Given a list of integers, return the product of all non-zero elements. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
509 Given a list of integers, give the largest n so that the sum of the first n elements equals the sum of the remaining elements. Code Completion Given a list of integers, give the largest n so that the sum of the first n elements equals the... CodeCheck Lists - Simple Exercises, Sums, Averages, Products
510 Given a list of integers, give the largest n ≤ length / 2 so that the sum of the first n elements equals the sum of the last n elements. Code Completion Given a list of integers, give the largest n ≤ length / 2 so that the sum of the first... CodeCheck Lists - Simple Exercises, Sums, Averages, Products
511 Given a list of integers, give the largest sum of n consecutive elements. Code Completion Given a list of integers, give the largest sum of n consecutive elements. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
512 Given a list of integers, return a list of length 2 containing the first and last element, in sorted order. Code Completion Given a list of integers, return a list of length 2 containing the first and last element, in sorted order. CodeCheck Lists - Simple Exercises, Two Answers
513 Given a list of integers, return a list of length 2 containing the minimum and the maximum. Code Completion Given a list of integers, return a list of length 2 containing the minimum and the maximum. CodeCheck Lists - Simple Exercises, Two Answers
514 Given a list of integers, return a list of length 2, with the number of positive and the number of negative elements in the list. Code Completion Given a list of integers, return a list of length 2, with the number of positive and the number of... CodeCheck Lists - Simple Exercises, Two Answers
515 Given a list of integers, return a list of length 2, each being a list. Code Completion Given a list of integers, return a list of length 2, each being a list. The first one holds the... CodeCheck Lists - Simple Exercises, Two Answers
516 Given a list of integers, return a list of length 2, each being a list. Code Completion Given a list of integers, return a list of length 2, each being a list. The first one holds the... CodeCheck Lists - Simple Exercises, Two Answers