Submission #265883

#	Time	Username	Problem	Language	Result	Execution time	Memory
265883		Fidisk	Guess the number (BOI20_guess)	C++14	100 / 100	2 ms	512 KiB

Guess

#include <bits/stdc++.h>
using namespace std;
 
#define oo 1e9
#define fi first
#define se second
#define sp(iiii) setprecision(iiii)
#define IO ios_base::sync_with_stdio(false); cin.tie(0)
#define ms(aaaa,xxxx) memset(aaaa,xxxx,sizeof(aaaa))
#define cntbit(xxxx) __builtin_popcount(xxxx)
#define getbit(xxxx,aaaa) ((xxxx>>(aaaa-1))&1)
#define _cos(xxxx) cos(xxxx*acos(-1)/180)
#define _sin(xxxx) sin(xxxx*acos(-1)/180)
#define _tan(xxxx) tan(xxxx*acos(-1)/180)
#define PE cout<<fixed
 
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<pair<int,int>,int> piii;
typedef pair<long long,long long> pll;
typedef pair<pair<long long,long long>,long long> plll;
 
const ld pi=acos(-1);

ll n,l,r,mid,x;

int main(){
    IO;
    cin>>n;
    l=1;
    r=n;
    while (l<=r) {
        ll mid=(r+l)/2;
        cout<<"? "<<mid<<endl;
        cin>>x;
        if (x==0) {
            cout<<"= "<<mid<<'\n';
            return 0;
        }
        else {
            if (x==-1) {
                l=mid+1;
            }
            else {
                r=mid-1;
            }
        }
    }
}

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