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#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

class Solution {

public:

int missingNumber(vector<int>& nums) {

int res = nums.size()*(nums.size()+1)/2;

for (auto& num:nums)

res-=num;

return res;

}

};

int main()

{

Solution solution;

return 0;

}