Submission #779913

#	Time	Username	Problem	Language	Result	Execution time	Memory
779913		makanhulia	Zagrade (COI20_zagrade)	C++17	100 / 100	816 ms	1100 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define ld long double
#define fi first
#define se second

vector<int> v;
int ans[100005];

int main() { 
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    int n, q, cnt = 0;
    cin >> n >> q;
    v.push_back(1);
    for (int i = 2; i <= n; i++) {
        if (v.empty()) {
            v.push_back(i);
            continue;
        }
        int id = v.back();
        cout << "? " << id << " " << i << endl;
        bool in;
        cin >> in;
        if (in) cnt++, ans[id] = 1, ans[i] = 2, v.pop_back();
        else v.push_back(i);
    }
    cnt = n / 2 - cnt;
    cout << "! ";
    for (int i = 1; i <= n; i++) {
        if (ans[i] == 1) cout << '(';
        else if (ans[i] == 2) cout << ')';
        else if (cnt > 0) {
            cout << ')';
            cnt--;
        }
        else cout << '(';
    }
    cout << endl;
}  

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