[LeetCode] 389.Find the Difference

[LeetCode] 389.Find the Difference

题目描述

解题思路

实验代码

题目描述

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.

解题思路

由于字符串t只比s多一个字母，且其他字母都相同，则可以采用异或的方法来解决这个问题，找到唯一的那个多出来的字母。

实验代码

class Solution {
public:
char findTheDifference(string s, string t) {
int temp = 0;
s = s + t;
int l = s.length();
for (int i = 0; i < l; i++)
temp ^= s[i] - 'a';
char c = 'a' + temp;
return c;
}
};