Backtracking has proven itself to be a universal algorithmic technique that can be applied while solving all kinds of computational problems, from the most primitive (such as counting all possible ...

// https://leetcode.com/problems/valid-permutations-for-di-sequence/discuss/168289/Share-my-O%28N3%29-greater-O%28N2%29-C++-DP-solution.-Including-the-thoughts-of ...

# Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. # In other words, one of the first string's permutations is the substring of the second string. # ...