389. Find the Difference

Given two strings s and t which consist of only lowercase letters.

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

Find the letter that was added in t.

Example:

Input:
s = "abcd"
t = "abcde"

Output:
e

Explanation:
'e' is the letter that was added.

127/150

思路：A^0=A， 水一道题睡觉。明天Career fair :)

public class Solution {
    public char findTheDifference(String s, String t) {
        int len=s.length(),len2=t.length();
        char res=t.charAt(len2-1);
        for(int i=0;i<len;i++){
            res^=s.charAt(i);
            res^=t.charAt(i);
        }
        return res;
    }
}