389. Find the Difference

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# 題目敘述

You are given two strings s and t .

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

Return the letter that was added to t .

# Example 1

Input: s = "abcd", t = "abcde"
Output: "e"
Explanation: 'e' is the letter that was added.

# Example 2

Input: s = "", t = "y"
Output: "y"

# 解題思路

# Solution

class Solution {

    public char findTheDifference(String s, String t) {

        char ans = 0;

        for(char c : s.toCharArray()) ans ^= c;

        for(char c : t.toCharArray()) ans ^= c;

        return ans;

    }

}