Given an array nums of n integers where each value is in range [1, n], return all integers in [1, n] that do not appear.
Example 1:
Input: 4 3 2 7 8 2 3 1 Output: 5 6
Example 2:
Input: 1 1 Output: 2
Input format: Space-separated integers.
Output format: Space-separated missing integers in ascending order.