class Solution {

public:

    vector<int> findDisappearedNumbers(vector<int>& nums) {

        vector<int> res;

        for(int i=; i<nums.size(); i++)

        {

            int tmp = abs(nums[i]) - ;

            nums[tmp] = nums[tmp]> ? -nums[tmp] : nums[tmp];

        }

        for(int i=; i<nums.size(); i++)

        {

            if(nums[i]>) res.push_back(i+);

        }

        return res;

    }

};