Submission #672400

#	Time	Username	Problem	Language	Result	Execution time	Memory
672400		horiseun	Zagrade (COI20_zagrade)	C++11	0 / 100	1 ms	208 KiB

zagrade

#include <iostream>
#include <vector>
#include <stack>
#include <climits>
#include <algorithm>
using namespace std;

int n, q, emp;
stack<int> unpaired;
char s[100005];
string ans;

int main() {

    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin >> n >> q;
    unpaired.push(0);
    for (int i = 1; i < n; i++) {
        if (unpaired.empty()) {
            unpaired.push(i);
            continue;
        }
        cout << "? " << unpaired.top() << " " << i << "\n";
        int res; cin >> res;
        if (res) {
            s[unpaired.top()] = '(';
            s[i] = ')';
            unpaired.pop();
        } else {
            unpaired.push(i);
        }
    }

    for (int i = 0; i < n; i++) {
        if (!(s[i] == '(' || s[i] == ')')) emp++;
    }
    emp /= 2;

    for (int i = 0; i < n; i++) {
        if (s[i] == '(' || s[i] == ')') {
            ans += s[i];
        } else {
            if (emp) {
                ans += ')';
                emp--;
            } else {
                ans += '(';
            }
        }
    }

    cout << "! " << ans << "\n";

}

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