Find-All-Numbers-Disappeared-in-an-Array.py

#link:https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/
class Solution:
    def findDisappearedNumbers(self, nums: List[int]) -> List[int]:
        for i in range(len(nums)):
            index = abs(nums[i]) - 1
            if nums[index] > 0:
                nums[index] *= -1 

        res = []
        for i in range(len(nums)):
            if nums[i] > 0:
                res.append(i + 1)

        return res