COCI 2019/2020 - Olympiad - Zagrade C++ Sample Source Code

#include <bits/stdc++.h>

using namespace std;

int main() {

    int n, q;
    cin >> n >> q;
    string s(n, ' ');

    for (int query = 1; query <= q; query++) {
        int a, b, x;
        // code
        cout << '?' << ' ' << a << ' ' << b << endl;
        cin >> x;
        // code
    }

    // code

    cout << '!' << ' ' << s << endl;

}