389. Find the Difference

Posted on Edited on In

389. Find the Difference

Description

Difficulty: Easy

Related Topics: Hash Table, String, Bit Manipulation, Sorting

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:

1
2
3
Input: s = "abcd", t = "abcde"
Output: "e"
Explanation: 'e' is the letter that was added.

Example 2:

1
2
Input: s = "", t = "y"
Output: "y"

Constraints:

  • 0 <= s.length <= 1000
  • t.length == s.length + 1
  • s and t consist of lowercase English letters.

Hints/Notes

  • use xor operation

Solution

Language: C++

1
2
3
4
5
6
7
8
9
10
11
12
13
class Solution {
public:
    char findTheDifference(string s, string t) {
        char res = 0;
        for (char c : s) {
            res ^= c;
        }
        for (char c : t) {
            res ^= c;
        }
        return res;
    }
};