Leetcode Problem 448. Find All Numbers Disappeared in an Array

448. Find All Numbers Disappeared in an Array

Leetcode Solutions

Iterate over each element in the input array nums.
For each element nums[i], compute the index index = abs(nums[i]) - 1 (to account for 0-based indexing).
If nums[index] is positive, negate it to mark that the number index + 1 has been seen.
After processing all elements, iterate over the array again.
For each index i, if nums[i] is positive, it means the number i + 1 was not seen, so add i + 1 to the result list.
Return the result list containing all missing numbers.

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