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# Exercise Title Features Description Platform Keywords
1 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
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 Run lengths Code Completion A run is a sequence of adjacent repeated values. For example, the array with elements CodeCheck Arrays and Array Lists
4 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
5 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
6 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
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 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
9 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
10 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
11 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
12 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
13 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
14 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
15 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
16 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
17 Construct a function that sorts a numeric array using Merge Sort. Construct a merge function that recursively splits a numeric array and takes a list as a parameter called data.
Consider that... 		jsParsons recursion, search algorithms, sorting, sorting algorithms
18 Selection sort Ascending-order Selection sort operates by finding the minimum element of an array and moving it to the “beginning” of the... PCEX recursion, search algorithms, sorting, sorting algorithms
19 Selection sort Challenge Descending-order Selection sort operates by finding the maximum element of an array and moving it to the “beginning” of the... PCEX
20 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
21 Sort real data Code Completion Your task is to sort an array list of path names such as CodeCheck Sorting and Searching
22 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
23 Processing a List of Temperature Values Construct a program that reads a series of temperatures and reports the average temperature and the number of the days... PCEX arrays
24 Rotating the List Values to the Right by Two Position Construct a program that has a function that receives a list of values and returns the list rotated to the... PCEX arrays
25 Rotating the List Values to the Right by Two Position Construct a program that has a function that receives a list of values and returns the list rotated to the... PCEX arrays
26 Complete Binary Tree Calculation Questions Calculation Exercise, Battery Self-practice questions requiring user to calcuate node positions and values in an array representation for a complete binary tree. OpenDSA Linked List
27 JLinkedListUtil This LinkedListUtil class tests various usages of the LinkedList class. The single param is an array of string. You will... PCEX
28 JLinkedListUtil Challenge This LinkedListUtil class tests various usages of the LinkedList class. The single param is an array of string. You will... PCEX
29 Insertion Sort Insertion sort works similarly to how one would sort a hand of cards: by choosing an element and searching through... PCEX recursion, search algorithms, sorting, sorting algorithms
30 Insertion Sort Challenge Insertion sort works similarly to how one would sort a hand of cards: by choosing an element and searching through... PCEX