Missing Number

Easy

Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing.

Example 1

Input:  nums = [3,0,1]
Output: 2

Example 2

Input:  nums = [0,1]
Output: 2

Constraints

• n == nums.length
• 1 <= n <= 10^4
• All numbers are distinct and in [0, n].