Submission #314774

#	Time	Username	Problem	Language	Result	Execution time	Memory
314774		apostoldaniel854	Zagrade (COI20_zagrade)	C++14	71 / 100	924 ms	888 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

bool ask (int a, int b) {
    cout << "? " << a << " " << b << endl;
    int ans;
    cin >> ans;
    return ans;
}

int main () {
    int n, Q;
    cin >> n >> Q;
    vector <int> unpaired (1, 1);
    vector <char> sol (n + 1);
    for (int i = 2; i <= n; i++) {
        if (unpaired.size () && ask (unpaired.back (), i)) {
            sol[unpaired.back ()] = '(';
            sol[i] = ')';
            unpaired.pop_back ();
        }
        else {
            unpaired.push_back (i);
        }
    }
    int sz = unpaired.size ();
    for (int i = sz / 2 + 1; i < sz; i++)
        sol[unpaired[i]] = '(';
    for (int i = 0; i < sz / 2; i++)
        sol[unpaired[i]] = ')';
    cout << "! ";
    for (int i = 1; i <= n; i++)
        cout << sol[i];
    cout << endl;
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 0 / 7
• Subtask 3: 57 / 57
• Subtask 4: 0 / 22