Submission #641961

#	Time	Username	Problem	Language	Result	Execution time	Memory
641961		kebine	Zagrade (COI20_zagrade)	C++17	0 / 100	673 ms	648 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;

int n, q;
char arr[100005];

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

int main() {
    cin >> n >> q;
    int sz = -1;

    vector<pair<int, int> > v;
    int l = 1, r = 2;
    while(r <= n) {
        int ret = ask(l, r);
        if (ret) {
            arr[l] = '(';
            arr[r] = ')';
            pair<int, int> res = make_pair(l, r);
            while (sz >= 0 && v[sz].second >= res.first - 1) {
                v.pop_back();
                sz--;
            }

            if (sz >= 0) {
                r++;
                l--;
            }
            else if(l > 1) {
              r++;
              l--;
            }
            else {
                r+=2;
                l = r - 1;
            }

            sz++;
            v.push_back(res);
        }
        else {
            r++;
            l = r - 1;
        }
    }

    cout << "! ";

    for(int i = 1; i <= n; i++) {
        cout << arr[i];
    }
    cout << endl;

}

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