389. Find the Difference

题目

Given two strings s and t which consist of only lowercase letters.

String t is generated by random shuffling string s and then add one more letter at a random position.

Find the letter that was added in t.

Example:

Input: s = “abcd” t = “abcde”

Output: e

Explanation: ‘e’ is the letter that was added. Subscribe to see which companies asked this question.

思路

和异或那道题一个思路，分别异或两个string的各个char，最后剩的就是那个多的char

代码