Submission #706281

#	Time	Username	Problem	Language	Result	Execution time	Memory
706281		vjudge1	Zagrade (COI20_zagrade)	C++17	71 / 100	856 ms	780 KiB

zagrade

#include <bits/stdc++.h>
#include <fstream>
//#define endl '\n'
#define mod 998244353
#define INF 100000000000
#define ll long long
///#define cin fin
///#define cout fout
#define fi first
#define se second
using namespace std;
///ofstream fout("herding.out");
///ifstream fin("herding.in");

int main()
{
    ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
    int n, q; cin >> n >> q; stack<int> st; st.push(1); string s; s.push_back('(');
    for(int i = 2; i <= n; i++) {
        if(st.empty()) {
            st.push(i);
            s.push_back('(');
            continue;
        }
        cout << '?' << ' ' << st.top() << ' ' << i << endl;
        int ans; cin >> ans;
        if(ans == 1) {
            st.pop();
            s.push_back(')');
        }
        else {
            st.push(i);
            s.push_back('(');
        }
    }
    cout << '!' << ' ' << s << endl;
    return 0;
}

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