Submission #447965

#	Time	Username	Problem	Language	Result	Execution time	Memory
447965		MOUF_MAHMALAT	Zagrade (COI20_zagrade)	C++11	100 / 100	1085 ms	1404 KiB

zagrade

#include<bits/stdc++.h>
#define all(s) s.begin(),s.end()
using namespace std;
typedef int ll;
ll n,q,a[100009],x,p[100009],id=2,o;
bool b;
ll gp(ll z)
{
    if(p[z]==z)
        return z;
    return p[z]=gp(p[z]);
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>q;
    x=n>>1;
    for(ll i=1; i<=n; i++)
        p[i]=i;
    while(id<=n)
    {
        o=gp(id-1);
        if(o==0)
        {
            id++;
            continue;
        }
        cout<<"? "<<o<<" "<<id<<endl;
        cin>>b;
        if(b)
        {
            x--;
            a[id]=-1;
            a[o]=1;
            p[id]=p[o]=o-1;
        }
        id++;
    }
    cout<<"! ";
    for(ll i=1; i<=n; i++)
    {
        if(a[i]==1)
            cout<<"(";
        else if(a[i]==-1)
            cout<<")";
        else if(x)
        {
            x--;
            cout<<")";
        }
        else
            cout<<"(";
    }
    return 0;
}

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