Category: hash
Given an N by N matrix of letters matrix, return whether there are exactly N different letters that appear in the matrix and each letter appears exactly once in …
Given an array arr of positive integers sorted in a strictly increasing order, and an integer k. Find the kth positive integer that is missing from this array. Example …
A string is called a happy prefix if is a non-empty prefix which is also a suffix (excluding itself). Given a string s. Return the longest happy prefix of …
Design a HashSet without using any built-in hash table libraries. To be specific, your design should include these functions: add(value): Insert a value into the HashSet. contains(value) : Return …
In Java, the Map (java.util.Map) is a Generic Interface that stores a key value pair: /* * @see HashMap * @see TreeMap * @see Hashtable * @see SortedMap * …