Given an array nums containing n distinct numbers in the range [0, n], return the one number in the range that is missing from the array.
Example 1:
Input: nums = [3, 0, 1]
Output: 2
Explanation: n = 3, range is [0, 3]. The number 2 is missing.
Example 2:
Input: nums = [0, 1]
Output: 2
Explanation: n = 2, range is [0, 2]. The number 2 is missing.
Example 3:
Input: nums = [9, 6, 4, 2, 3, 5, 7, 0, 1]
Output: 8
Explanation: n = 9, range is [0, 9]. The number 8 is missing.
n == nums.length1 <= n <= 10^40 <= nums[i] <= nnums are unique