位操作－leetcode 389 Find the Difference

原题链接：Find the Difference

题解：

class Solution {public:    char findTheDifference(string s, string t) {        /*            Time Complexity:O(m+n)            Space Complexity:O(1)        */        char r=0;        for(auto &c:s)r^=c;        for(auto &c:t)r^=c;        return r;    }};