Problem 389: Find the Difference

https://leetcode.com/problems/find-the-difference/

思路

• 使用异或关系判断

public class Solution {
    public char findTheDifference(String s, String t) {
        char ans = 0;
        for (int i = 0; i < s.length(); i++) {
            ans ^= s.charAt(i);
        }
        for (int i = 0; i < t.length(); i++) {
            ans ^= t.charAt(i);
        }

        return ans;
    }
}