HackerRank Square Subsequences Solution
In this post, we will solve HackerRank Square Subsequences Problem Solution. Square Subsequences A string is called a square string if it can be obtained by concatenating two copies of the same string. For example, “abab”, “aa” are square strings, while “aaa”, “abba” are not. Given a string, how many (non-empty) subsequences of the string…