Submission #1192194

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192194		prideliqueee	Guess the number (BOI20_guess)	C++20	100 / 100	0 ms	408 KiB

Guess

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

• Subtask 1: 29 / 29
• Subtask 2: 71 / 71