[LeetCode]Find the Difference

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

位运算

最优解：

public char findTheDifference(String s, String t) { int n = t.length(); char c = t.charAt(n - 1); for (int i = 0; i < n - 1; ++i) { c ^= s.charAt(i); c ^= t.charAt(i); } return c; }

我的解：

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