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"
Example 3:
Input: s = "a", t = "aa"
Output: "a"
Example 4:
Input: s = "ae", t = "aea"
Output: "a"
Constraints:
- 0 <= s.length <= 1000
- t.length == s.length + 1
- s and t consist of lower-case English letters.
Solution
class Solution {
public char findTheDifference(String s, String t) {
int xor = 0;
for (char c : s.toCharArray()) {
xor = xor ^ c;
}
for (char c : t.toCharArray()) {
xor = xor ^ c;
}
return (char) xor;
}
}