Submission #1003769

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003769		vjudge1	Zagrade (COI20_zagrade)	C++17	100 / 100	632 ms	2224 KiB

zagrade

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

#define N 200010
#define INFLL 2000000000000000020
#define pb push_back

typedef long long ll;
typedef pair<ll,ll> pll;

vector<ll>pos;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    ll n,q,i=1,sz;
    string ans=" ";
    bool ret;

    cin >> n >> q;
    for(i=1;i<=n;i++)
    {
        ans+="(";
    }
    i=1;
    while(i<=n)
    {
        if(pos.empty())
        {
            pos.pb(i);
            i++;
            continue;
        }
        cout << "? " << pos.back() << " " << i << endl;
        fflush(stdout);
        cin >> ret;
        if(ret)
        {
            ans[i]=')';
            pos.pop_back();
        }else
        {
            pos.pb(i);
        }
        i++;
    }
    sz=(ll)(pos.size());
    for(i=0;i<sz/2;i++)
        ans[pos[i]]=')';
    cout << "!" << ans << endl;
    fflush(stdout);

    return 0;
}

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