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;
    }
}