difference between two string.txt

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:

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




class Solution {
public:
    char findTheDifference(string s, string t)
    {
        char r = 0;
        for(char c : s)
            r = r ^ c;
        
        for(char c : t)
            r = r ^ c;
        
        return r;
        
        
    }
};