Submission #706247

#	Time	Username	Problem	Language	Result	Execution time	Memory
706247		vjudge1	Zagrade (COI20_zagrade)	C++17	0 / 100	637 ms	736 KiB

zagrade

#include <bits/stdc++.h>
// #define endl '\n'
#define FAST ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define int ll
typedef long long ll;
using namespace std;
const int N = 200000 + 10;
bool vis[N];
signed main() {
    FAST;
    int n, q;
    cin >> n >> q;
    stack<int> st;
    st.push(0);
    vis[0] = 1;
    for(int i = 1; i < n - 1; i++) {
        if(!st.size()) st.push(1);
        else {
            cout << "? " << st.top() + 1 << ' ' << i + 1 << endl;
            int x;
            cin >> x;
            if(x == 1) st.pop();
            else {
                st.push(i);
                vis[i] = 1;
            }
        }
    }
    string s = "";
    for(int i = 0; i < n; i++) {
        if(vis[i]) s += "(";
        else s += ")";
    }
    cout << "! " << s << endl;
    return 0;
}

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