Submission #1152344

#	Time	Username	Problem	Language	Result	Execution time	Memory
1152344		WongYiKai	Zagrade (COI20_zagrade)	C++20	100 / 100	230 ms	1336 KiB

zagrade

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

int main(){
	//ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	
	ll n,q;
    cin >> n >> q;
    char ans[n+5];
    for (int i=1;i<=n;i++){
        ans[i] = '?';
    }
    stack<ll> s;
    s.push(1);
    ll count=0;
    ll curr=2;
    while (curr<=n){
        if (s.empty()) {
            s.push(curr);
            curr++;
        }
        ll x = s.top();
        s.pop();
        cout << "? " << x << ' ' << curr << endl;
        ll a;
        cin >> a;
        if (a==1){
            ans[x] = '(';
            ans[curr] = ')';
            count += 2;
        }
        else{
            s.push(x);
            s.push(curr);
        }
        curr++;
    }
    cout << "! ";
    ll left = n-count;
    left /= 2;
    for (int i=1;i<=n;i++){
        if (ans[i]=='?'){
            if (left>0) cout << ')';
            else cout << '(';
            left--;
        }
        else cout << ans[i];
    }
}

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