Submission #642325

#	Time	Username	Problem	Language	Result	Execution time	Memory
642325		berr	Colors (BOI20_colors)	C++17	0 / 100	0 ms	208 KiB

Colors

#include <bits/stdc++.h>
using namespace std;
#define int long long
int l, r, ans, c;

void query(int x)
{
    cout<<"? "<<x<<endl;

    cin>>ans;
}


int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    int n; cin>>n;

        l=max(1LL, n/3), r=l;

    query(l);
    int t=1;
  


    for(int i=31; i>=0; i--)
    {
		int pf=0;


        if(t%2==1)
        {
            if((1LL<<i)+r<=n)
                {
                    r+=(1LL<<i);
                    query(r);
                    if(ans==1)
                    {
                        pf=1;
                        t=0;
                        l+=min(r-l, 1LL<<i);
                    }
        
                }
                if(l-(1LL<<i)>0LL&&pf==0)
                {
                    l-=(1LL<<i);
                    query(l);
                    if(ans==1)
                    {
                        r-=min(r-l, (1LL<<i));
                    }
        
                }
        }
        else
        {
                 if(l-(1LL<<i)>0LL)
                {
                    l-=(1LL<<i);
                    query(l);
                    if(ans==1)
                    {
                        pf=1;
                        t=1;
                        r-=min(r-l, (1LL<<i));
                    }
        
                }
                            if((1LL<<i)+r<=n&&pf==0)
                {
                    r+=(1LL<<i);
                    query(r);
                    if(ans==1)
                    {
                        l+=min(r-l, 1LL<<i);
                    }
        
                }
        }

    }
      
    cout<<"= "<<abs(l-r)+1<<endl;



}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 33