제출 #920716

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
920716		zeta7532	Zagrade (COI20_zagrade)	C++17	100 / 100	631 ms	5456 KiB

zagrade

#include <bits/stdc++.h>
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
using ll = long long;
const ll mod = 998244353;
#define fi first
#define se second
#define rep(i,n) for(ll i=0;i<n;i++)
#define all(x) x.begin(),x.end()
#define faster ios::sync_with_stdio(false);cin.tie(nullptr)
 
int main() {
    ll N,Q;
    cin >> N >> Q;
    vector<char> ans(N,'-');
    ll l=0;
    ll r=1;
    set<ll> s;
    rep(i,N) s.insert(i);
    while(1){
        if(r>=N) break;
        cout << "?" << " " << l+1 << " " << r+1 << endl;
        ll q;
        cin >> q;
        if(q==0){
            if(ans[l]=='(') ans[r]='(';
            l=r;
            r=l+1;
        }
        if(q==1){
            s.erase(l);
            s.erase(r);
            ans[l]='(';
            ans[r]=')';
            if(s.size()==0) break;
            if((*s.begin())>l){
                l=r+1;
                r=l+1;
            }else{
                auto it=s.upper_bound(l);
                it--;
                l=*it;
                r=r+1;
            }
        }    
    }
    ll cnt=0;
    rep(i,N) if(ans[i]=='-') cnt++;
    ll now=0;
    rep(i,N){
        if(ans[i]=='-'){
            if(now<cnt/2) ans[i]=')';
            if(now>=cnt/2) ans[i]='(';
            now++;
        }
    }
    cout << "!" << " ";
    rep(i,N) cout << ans[i];
    cout << endl;
    return 0;
}

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