D. J.:

- Added the leetcode problem and solution for 389

Author: nobodyPerfecZ

README.md

@@ -229,6 +229,7 @@
 - [377 Combination Sum IV](https://leetcode.com/problems/combination-sum-iv/description/)
 - [380 Insert Delete GetRandom O(1)](https://leetcode.com/problems/insert-delete-getrandom-o1/description/)
 - [383 Ransom Note](https://leetcode.com/problems/ransom-note/description/)
+- [389 Find the Difference](https://leetcode.com/problems/find-the-difference/description/)
 - [392 Is Subsequence](https://leetcode.com/problems/is-subsequence/description/)
 - [394 Decode String](https://leetcode.com/problems/decode-string/description/)
 - [399 Evaluate Division](https://leetcode.com/problems/evaluate-division/description/)

awesome_python_leetcode/_389_find_the_difference.py

@@ -0,0 +1,16 @@
+class Solution:
+    """Base class for all LeetCode Problems."""
+
+    def findTheDifference(self, s: str, t: str) -> str:
+        """
+        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.
+        """
+        result = 0
+        for c in s + t:
+            result ^= ord(c)
+        return chr(result)

tests/test_389_find_the_difference.py

@@ -0,0 +1,16 @@
+import pytest
+
+from awesome_python_leetcode._389_find_the_difference import Solution
+
+
+@pytest.mark.parametrize(
+    argnames=["s", "t", "expected"],
+    argvalues=[
+        ("abcd", "abcde", "e"),
+        ("", "y", "y"),
+    ],
+)
+def test_func(s: str, t: str, expected: str):
+    """Tests the solution of a LeetCode problem."""
+    difference = Solution().findTheDifference(s, t)
+    assert difference == expected