[codeforces] School Marks C++ solution

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n,k,p,x,y;
    cin >> n >> k >> p >> x >> y; //reading
    int goods=0,sum=0;            //goods: number of ai's, where ai>=y    sum: sum of ai's
    vector<int> a; a.reserve(n);  //the given tests
    for(int i=0;i<k;++i)
    {
        int ai;            //the current test
        cin >> ai;         //reading
        a.push_back(ai);   //adding into the vector
        sum+=ai;           //...
        if(y<=ai) goods++; //...
    }
    vector<int> ans;       //the vector, where we hold our answers
    while(goods<(n-goods)) //In the Editorial, the first condition
    {
        ans.push_back(y);
        goods++;
        sum+=y;
    }
    if( ans.size()+a.size()>n ) //If we have to write more than n tests to satisfy the condtition, then we're wrong.
    {
        cout << "-1\n";
        return 0;
    }
    while(ans.size()+a.size()<n) //First condition: ok, then fill the remaining space with ones.
    {
        ans.push_back(1);
        sum++;
    }
    if( sum > x ) //Second Condition
    {
        cout << "-1\n";
        return 0;
    }
    for(auto i:ans) //Simply print the answer to the problem
    {
        cout << i << " ";
    }
    cout << "\n";


    return 0;
}