In this lab, you will be tasked with finding all the disappeared numbers in an array. The array nums will contain n integers where each number, nums[i], is in the range [1, n]. Your task is to return an array of all the integers within the range [1, n] that do not appear in nums. Use the ESM (ECMAScript Module) import/export for this lab.

Lab Description

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 do not appear in nums.

Example 1:

Input: nums = [4,3,2,7,8,2,3,1]
Output: [5,6]

Example 2:

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

Example 3:

Input: nums = [2,2,3,4,5,6,7,8]
Output: [1]

Constraints:

• n == nums.length
• 1 <= n <= 105
• 1 <= nums[i] <= n

Follow up: Could you do it without extra space and in O(n) runtime? You may assume the returned list does not count as extra space.

Challenges

1. Implement the findDisappearedNumbers function that takes in an array nums and returns an array of missing numbers.
2. The function should not use extra space and should have a runtime of O(n).