Merge pull request #1847 from CodingTestStudy2/최원준

[최원준] Day19

Author: github-actions[bot]

leetcode3/최원준/3978. Unique Middle Element.py

@@ -0,0 +1,4 @@
+from collections import defaultdict
+class Solution:
+    def isMiddleElementUnique(self, nums: list[int]) -> bool:
+        return Counter(nums)[nums[len(nums)//2]] == 1