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# Exercise Title Features Description Platform Keywords
1 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
2 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
3 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
4 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
5 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
6 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
7 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
8 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
9 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
10 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
11 Call Structure for the Fibonacci Sequence Problem Algorithm Visualization Slideshow showing the tree structure for calls by a recursive implementation of the Fibonacci sequence calculation. OpenDSA Dynamic Programming, Fibonacci Sequence
12 Call Structure for the Chained Matrix Multiplication Problem Algorithm Visualization Slideshow showing the tree structure for calls by a solution to the chained matrix multiplication problem. OpenDSA Dynamic Programming, Chained Matrix Multplication Problem
13 Bintree Interactive Visualization Algorithm Visualization, User Supplied Data Interactive Algorithm Visualization for the Bintree data structure. User can click to indicate where a point should be inserted or... OpenDSA Bintree
14 Full Binary Tree Serialization Slideshow: Mark Bits Algorithm Visualization Slideshow how to reconstruct a full binary tree from a serialized representation of its node values. All that is needed... OpenDSA Serialization, Binary Tree
15 The Class for Representing a Bank Account Construct a class that represents a basic bank account. This class should contain data representing the name of the account’s... PCEX classes, data structures, objects, stacks
16 JSON Iterate 2 Using JSON structure list codes for first three flights jsParsons json, json-iterate