Submission #1217562

#	Time	Username	Problem	Language	Result	Execution time	Memory
1217562		VMaksimoski008	Zagrade (COI20_zagrade)	C++17	Compilation error	0 ms	0 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, '.');
    ans[1] = '(';

    stack<int> st; st.push(1);
    for(int i=2; i<=n; i++) {
        if(st.empty()) {
            st.push(i);
            s[i] = '(';
            continue;
        }
        int x = ask(st.top(), i);
        if(x == 1) {
            ans[i] = ')';
            st.pop();
        } else {
            ans[i] = '(';
            st.push(i);
        }
    }

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

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.cpp:30:13: error: 's' was not declared in this scope
   30 |             s[i] = '(';
      |             ^