Solution: Substring with Concatenation of All Words
Discover how to implement a sliding window technique to solve the substring with concatenation of all words problem. This lesson teaches you to use frequency maps and window boundaries to efficiently locate valid substrings in a string, enhancing your skills in string manipulation and pattern-based problem solving.
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Statement
You are given a string, s, and an array of strings, words. All strings in words are of the same length.
A concatenated string is a string that contains all the words in words exactly once, in any order, concatenated together without any intervening characters.
Formally, a concatenated string is a permutation of all words joined together. For example, if words = ["ab", "cd", "ef"], then the following are all valid concatenated strings: "abcdef", "abefcd", "cdabef", "cdefab", "efabcd", "efcdab". However, "acdbef" is not valid because it is not formed by concatenating all the words in any order.
Your task is to return all starting indices of substrings in s that are concatenated strings.
You may return the indices in any order. ...