Submission #1154262

#	Time	Username	Problem	Language	Result	Execution time	Memory
1154262		huoi	Zagrade (COI20_zagrade)	C++17	71 / 100	224 ms	1012 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define INF 1e18

void solve() {
    int n, q;
    cin >> n >> q;

    string ans;
    stack<int> st;

    for (int i = 0; i < n; i++) {
        if (st.empty()) {
            ans += '(';
            st.push(i);
            continue;
        }

        cout << "? " << st.top() + 1 << " " << i + 1 << endl;
        bool valid; cin >> valid;

        if (valid) {
            ans += ')';
            st.pop();
        } else {
            ans += '(';
            st.push(i);
        }
    }

    cout << "! " << ans << endl;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}

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