找不同

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.

输入给两个只包含小写字母的字符串 S 和 T.

字符串 T 是在字符串 S 基础上添加一个小写字母, 然后随机打乱之后生成.

请找出那个被加入的小写字母.

示例:

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

Output:
e

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

在线测试网站: https://leetcode.com/problems/find-the-difference/description

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