Leetcode question solution in python, updating.Including array, backtrack, binary search, bit manipulation, dynamic programming, graph, greedy algorithm, hashtable, heap, linked list, math, queue & ...

# if s2 contains the permutation of s1. In other words, # one of the first string's permutations is the substring of the second string.

To create a directed graph in Python for solving problems on LeetCode, you typically represent the graph using data structures such as adjacency lists.