Submission #1096294

#	Time	Username	Problem	Language	Result	Execution time	Memory
1096294		laure	Colors (BOI20_colors)	C++14	0 / 100	0 ms	344 KiB

Colors

#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin>>n;
    int l=1,r=n;
    int x;
    if(n==2)
    {
        cout<<"? 1"<<endl;
        cin>>x;
        cout<<"? 2"<<endl;
        cin>>x;
        if(x==0)cout<<"= 2"<<endl;
        else cout<<"= 1"<<endl;
        return 0;
    }
    int a,b;
    a=(1+n/2+1)/2;
    cout<<"? "<<a<<endl;
    cin>>x;
    while(l<r)
    {
        int mid=(l+r)/2;
        if(a==mid){mid--;l--;}
        if(a<mid)b=a+mid;
        else b=a-mid;
        a=b;
        cout<<"? "<<b<<endl;
        cin>>x;
        if(x==0)
        {
            l=mid+1;
        }
        else
        {
            r=mid;
        }
    }
    if(x==1)cout<<"= "<<l<<endl;
    else cout<<"= "<<r<<endl;
}

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