Submission #557798

#	Time	Username	Problem	Language	Result	Execution time	Memory
557798		Yazan_Alattar	Zagrade (COI20_zagrade)	C++14	14 / 100	1427 ms	324 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define F first
#define S second
#define pb push_back
#define endl "\n"
#define all(x) x.begin(), x.end()
const int M = 500007;
const ll inf = 2e9;
const ll mod = 1e9 + 7;
const double pi = acos(-1);
const double eps = 1e-6;
const int dx[] = {0, -1, 0, 1}, dy[] = {1, 0, -1, 0};
const int block = 320;

char ans[M];
int n, q;

int ask(int l, int r){
    cout << "? " << l << " " << r << endl;
    cout.flush();

    int ret; cin >> ret;
    return ret;
}

void solve(int l, int r){
    if(l > r) return;

    for(int i = l + 1; i <= r; i += 2){
        if(ask(l, i)){
            ans[l] = '(';
            ans[i] = ')';
            solve(l + 1, i - 1);
            solve(i + 1, r);
            return;
        }
    }
    solve(l + 1, r);
    return;
}

int main(){
//        ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> q;
    solve(1, n);

    int rem = n / 2;
    for(int i = 1; i <= n; ++i) if(ans[i] == ')') --rem;

    cout << "! ";
    for(int i = 1; i <= n; ++i){
        if(ans[i]) cout << ans[i];
        else if(rem) cout << ')', --rem;
        else cout << '(';
    }
    cout << endl;
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 0 / 7
• Subtask 3: 0 / 57
• Subtask 4: 0 / 22