text: class Solution:
      def findDisappearedNumbers(self, nums: List[int]) -> List[int]:
          n = len(nums)
          res = []
          for i in range(n):
              if nums[abs(nums[i]) - 1] > 0:
                  nums[abs(nums[i]) - 1] *= -1
          for i in range(n):
              if nums[i] > 0:
                  res.append(i + 1)
          return res
  