Web Reference: Permutation in String - Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. In other words, return true if one of s1's permutations is the substring of s2. The function recursively swaps characters to create permutations and performs early exits if a valid permutation is found. Jul 23, 2025 · To generate permutations of size four, we consider all above six permutations of size three and insert 4 at different positions in every permutation. An efficient solution is to use Johnson and Trotter algorithm to generate all permutations iteratively.
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