Submission #357657

#	Time	Username	Problem	Language	Result	Execution time	Memory
357657		leinad2	Colors (BOI20_colors)	C++17	0 / 100	1 ms	364 KiB

Colors

#include<bits/stdc++.h>
using namespace std;
long long n, a, b, m, prv, ans;
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n;
    prv=1;
    cout<<"? "<<prv<<endl;
    cin>>ans;
    a=1;b=n;
    while(a<b)
    {
        m=(a+b)/2;
        if(prv-m<1&&prv+m>n)
        {
            cout<<"? 1"<<endl;
            cin>>ans;
            prv=1;
        }
        if(prv-m>=1)
        {
            prv-=m;
            cout<<"? "<<prv<<endl;
            cin>>ans;
            if(ans==1)b=m;
            else a=m+1;
        }
        else
        {
            prv+=m;
            cout<<"? "<<prv<<endl;
            cin>>ans;
            if(ans==1)b=m;
            else a=m+1;
        }
    }
    cout<<"= "<<a<<endl;
}

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