Given an array, nums, of $n$ integers where nums[i] is in the range $[1, n]$, return an array of all the integers in the range $[1, n]$ that doesn’t appear in nums.

Constraints:

• $n =$ nums.length

• $1 \leq n \leq 10^3$

• $1 \leq$ nums[i] $\leq n$