Submission #1220362

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220362		vladilius	Zagrade (COI20_zagrade)	C++20	71 / 100	232 ms	876 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, q; cin>>n>>q;
    
    auto ask = [&](int l, int r){
        cout<<"? "<<l<<" "<<r<<"\n";
        cout.flush();
        bool x; cin>>x;
        return x;
    };
    
    vector<int> p;
    string out;
    int i = 1;
    
    while (i <= n){
        if (p.empty()){
            out += "(";
            p.pb(i++);
            continue;
        }
        bool x = ask(p.back(), i);
        if (x){
            out += ")";
            p.pop_back();
        }
        else {
            out += "(";
            p.pb(i);
        }
        i++;
    }
    
    cout<<"! "<<out<<"\n";
}

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