Grokking the Coding Interview: Patterns for Coding Questions
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Problem Challenge 4: Words Concatenation (hard)

Problem Statement

Given a string and a list of words, find all the starting indices of substrings in the given string that are a concatenation of all the given words exactly once without any overlapping of words. It is given that all words are of the same length.

Example 1:

Input: String="catfoxcat", Words=["cat", "fox"]  
Output: [0, 3]  
Explanation: The two substring containing both the words are "catfox" & "foxcat".

Example 2:

Input: String="catcatfoxfox", Words=["cat", "fox"]  
Output: [3]




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