leetcode 解题思路

Given two strings, write a method to decide if one is a permutation of the other.ExampleExample 1: Input: "abcd", "bcad" Output: TrueExample 2: Input: "aac", "abc" Output: False思路：cou...

DescriptionImplementstrStrfunction in O(n + m) time.strStrreturn the first index of the target string in a source string. The length of the target string ismand the length of the source strin...