Problem: Substring with Concatenation of All Words
Explore how to identify all starting positions of substrings formed by concatenating every word from a given list exactly once in a larger string. Learn to implement an efficient sliding window and hash table approach in C# to solve this problem while managing duplicates and optimizing for time and space complexity.
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Statement
You are given a string s and a string array words, where every string in words has the same length.
A concatenated string is formed by taking any permutation of words and concatenating all the strings in that permutation together. In other words, it is a string that contains every element of words exactly in the order defined by some permutation, with no extra characters.
Return a list of all starting indices in s where a substring that is a concatenated string begins. The answer may be returned in any order.
Note: The array
wordsmay contain duplicate strings.
Constraints:
s.Lengthwords.Lengthwords[i].Length...