For example, ball < cat, dog < dorm, Happy < happy, Zoo < ball. A substring of a string is a contiguous block of characters in the string. For example, the substrings of abc are a, b, c, ab, bc, and ...

You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that is a concatenation of each word in words exactly once and ...