#389

Find the Difference

easy · verified · 60.2% accepted · 5,453 likes · top 59%

hash table · string · bit manipulation · sorting

⊣ practice⊣ quiz⊣ open on leetcode ↗

Description

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"

Solution