Submission #642273

#	Time	Username	Problem	Language	Result	Execution time	Memory
642273		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;

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=n/2, r=l;

    query(l);
    int t=1;

    for(int i=62; i>=0; i--)
    {
        if(t%2==1&&(1LL<<i)+r<=n)
        {
            r+=(1LL<<i);
            query(r);
            if(ans==1)
            {
                l+=min(n-l, 1LL<<i);
            }
            t++;
        }
        else if((t%2==0)&&(1LL<<i)<l)
        {
            l-=(1LL<<i);
            query(l);
            if(ans==1)
            {
                r-=min(r, (1LL<<i));
            }
            t++;
        }
    }

    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