#268. Missing Number

Author: papilo-cloud

missing_number.py

@@ -0,0 +1,33 @@
+# Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.
+
+# Example 1:
+# Input: nums = [3,0,1]
+# Output: 2
+# Explanation: n = 3 since there are 3 numbers, so all numbers are in the range [0,3]. 2 is the missing number in the range since it does not appear in nums.
+
+# Example 2:
+# Input: nums = [0,1]
+# Output: 2
+# Explanation: n = 2 since there are 2 numbers, so all numbers are in the range [0,2]. 2 is the missing number in the range since it does not appear in nums.
+
+# Example 3:
+# Input: nums = [9,6,4,2,3,5,7,0,1]
+# Output: 8
+# Explanation: n = 9 since there are 9 numbers, so all numbers are in the range [0,9]. 8 is the missing number in the range since it does not appear in nums.
+ 
+
+# Constraints:
+
+# n == nums.length
+# 1 <= n <= 104
+# 0 <= nums[i] <= n
+# All the numbers of nums are unique.
+
+
+
+
+class Solution:
+    def missingNumber(self, nums: list[int]) -> int:
+        n = len(nums)
+        summ = (n*(n+1)//2 ) - sum(nums)
+        return summ