Leetcode 389. Find the Difference

Seawolf

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.

class Solution:
    def findTheDifference(self, s: str, t: str) -> str:
        c = ord(t[len(t) - 1])
        for i in range(len(s)):
            c ^= ord(s[i])
            c ^= ord(t[i])
        return chr(c)