Submission #1217573

#	Time	Username	Problem	Language	Result	Execution time	Memory
1217573		VMaksimoski008	Zagrade (COI20_zagrade)	C++17	100 / 100	249 ms	1156 KiB

zagrade

#include <bits/stdc++.h>
#define ar array
//#define int long long

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const ll inf = 1e18;
const int N = 1e5 + 5;

int ask(int i, int j) {
    cout << "? " << i << " " << j << endl;
    int x; cin >> x;
    return x;
} 

signed main() {
    int n, q; cin >> n >> q;
    string ans(n+1, '.');

    vector<int> st;
    for(int i=1; i<=n; i++) {
        if(st.empty()) {
            st.push_back(i);
            continue;
        }
        if(ask(st.back(), i)) {
            ans[i] = ')';
            ans[st.back()] = '(';
            st.pop_back();
        } else st.push_back(i);
    }

    for(int i=0; i<st.size(); i++) {
        if(i < st.size() / 2) ans[st[i]] = ')';
        else ans[st[i]] = '(';
    }

    cout << "! ";
    for(int i=1; i<=n; i++) cout << ans[i];
    cout << endl;
}

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