Leetcode 389. Find the Difference

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.

使用 字符异或即可

class Solution {
public:
    char findTheDifference(string s, string t) {
        char c = 0;
        for(int i = 0;i < s.length();++i)
        {
            c ^= s[i];
        }
        for(int j = 0;j < t.length();++j)
        {
            c ^= t[j];
        }
        return c;
    }
};