[LeetCode] Problem 389 - Find the Difference

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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.

Code

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public char findTheDifference(String s, String t) {
    int n = s.length();
    char ch = t.charAt(n);

    for (int i = 0; i < n; i++)
        ch ^= s.charAt(i) ^ t.charAt(i);
    
    return ch;
}