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#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

class Solution {

public:

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

vector<int> res(nums.size()+1, 0);

for (size_t i=0;i<nums.size(); ++i)

{

++res[nums[i]];

}

nums.clear();

for (size_t i=1; i<res.size(); ++i)

{

if (res[i] == 0)

{

nums.push_back(i);

}

}

return nums;

}

};

int main()

{

Solution solution;

return 0;

}