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.
\n
Example 1:
\nInput: nums = [4,3,2,7,8,2,3,1]\nOutput: [5,6]\n
Example 2:
\nInput: nums = [1,1]\nOutput: [2]\n\n
\n
Constraints:
\n\nn == nums.length1 <= n <= 1051 <= nums[i] <= n\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.
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