LeetCode 289.
Complexity Time complexity: O(n^2)
LeetCode 48.
Complexity Time complexity: O(n^2)
LeetCode 54.
Complexity Time complexity: O(n)
LeetCode 1382.
Complexity Time complexity: O(n)
LeetCode 30.
Question ``` You are given a string s and an array of strings words. All the strings of words are of the same length.