Submission #1154338

#	Time	Username	Problem	Language	Result	Execution time	Memory
1154338		MinhTuan11	Zagrade (COI20_zagrade)	C++20	100 / 100	228 ms	1356 KiB

zagrade

#include <bits/stdc++.h>

#define int long long
#define fi first
#define se second

const int N = 2e5 + 5;
const int K = 1e2 + 5;
const int mod = 1e9 + 7;
const int inf = 1e18 + 7;

#define all(v) (v).begin(), (v).end()
#define pii pair<int, int>

using namespace std;

mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());

int n, q;
stack<int> st;

int ask(int l, int r) {
	cout << "? " << l << ' ' << r << endl;
	int rep;
	cin >> rep;
	return rep;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    if(ifstream("file.inp")){
    	freopen("file.inp", "r", stdin);
    	freopen("file.out", "w", stdout);
    }

    cin >> n >> q;
    string s(n, '.');

    for(int i = 1; i <= n; i++) {
        if(st.size() == 0) {
            st.push(i);
            continue;
        }
    	int rep = ask(st.top(), i);
    	if(rep == 1) {
    		s[st.top() - 1] = '(';
    		s[i - 1] = ')';
    		st.pop();
    	}
    	else {
    		st.push(i);
    	}
    }

    int rem = st.size();
    for(int i = 1; i <= rem / 2; i++) {
    	s[st.top() - 1] = '(';
    	st.pop();
    }
    for(int i = 1; i <= rem / 2; i++) {
    	s[st.top() - 1] = ')';
    	st.pop();
    }
    cout << "! " << s << endl;

    return 0;
}

// tuntun172

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen("file.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
zagrade.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen("file.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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