Submission #583780

#	Time	Username	Problem	Language	Result	Execution time	Memory
583780		eecs	Zagrade (COI20_zagrade)	C++17	100 / 100	901 ms	1188 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n >> *new int;
    auto ask = [&](int a, int b) {
        cout << "? " << a + 1 << " " << b + 1 << endl;
        return cin >> a, a;
    };
    string res(n, '(');
    vector<int> st;
    for (int i = 0; i < n; i++) {
        if (st.empty() || !ask(st.back(), i)) st.push_back(i);
        else res[i] = ')', st.pop_back();
    }
    for (int i = 0; i < st.size() / 2; i++) {
        res[st[i]] = ')';
    }
    cout << "! " << res << endl;
    return 0;
}

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.cpp:17:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for (int i = 0; i < st.size() / 2; i++) {
      |                     ~~^~~~~~~~~~~~~~~

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