feat : Missing Number

Author: HodaeSsi

missing-number/HodaeSsi.py

@@ -0,0 +1,9 @@
+class Solution:
+	def missingNumber(self, nums: List[int]) -> int:
+		n = len(nums)
+		expected_sum = (n ** 2 + n) // 2
+		
+		actual_sum = sum(nums)
+		
+		return expected_sum - actual_sum
+