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Find The Difference

Problem Statement​

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.

Leetcode link

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.

Code​

Python Code

class Solution:
    def findTheDifference(self, s: str, t: str) -> str:
        c = 0
        for cs in s: c ^= ord(cs) #ord is ASCII value
        for ct in t: c ^= ord(ct)
        return chr(c) #chr = convert ASCII into character