Submission #1134131

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134131		lopkus	Zagrade (COI20_zagrade)	C++20	71 / 100	224 ms	1636 KiB

zagrade

#include <bits/stdc++.h>

#define int long long

using namespace std;

int ask(int l, int r) {
    cout << "? " << l << " " << r;
    cout << endl;
    int x;
    cin >> x;
    return x;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, q;
    cin >> n >> q;
    stack<int> s;
    s.push(1);
    vector<int> a(n + 1, - 1);
    a[1] = 1;
    for(int i = 2; i <= n; i++) {
        if(!s.size()) {
            a[i] = 1;
            s.push(i);
            continue;
        }
        if(ask(s.top(), i)) {
            a[i] = 0;
            s.pop();
        }
        else {
            a[i] = 1;
            s.push(i);
        }
    }
    cout << "! ";
    for(int i = 1; i <= n; i++) {
        if(a[i]) {
            cout << "(";
        }
        else {
            cout << ")";
        }
    }
}

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