Missing Number

Challenge Points: 10

Level: Easy

You are given an array nums that contains n distinct integers in the range [0, n].
The array represents a sequence of unique numbers, but exactly one number is missing from the full range.

Your task is to find and return the missing number.

Example 1:

Input: nums = [4, 2, 1, 0]

Output: 3

Example 2:

Input: nums = [1, 2, 3, 4]

Output: 0

Example 3:

Input: nums = [5, 3, 0, 1, 4]

Output: 2

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