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

    public char findTheDifference(String s, String t) {        String st = s + t;        char[] chs = st.toCharArray();        char result = chs[0];        for (int i = 1; i < chs.length; i++) {            result^=chs[i];        }        return result;    }

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

合并后 异或

一 刷：

[leetcode] 389. Find the Difference 解题报告