제출 #666677

#제출 시각아이디문제언어결과실행 시간메모리
666677divadGuess the number (BOI20_guess)C++14
100 / 100
2 ms296 KiB
#include <iostream>
using namespace std;
int n,st,dr,val;

int main()
{
    cin >> n;
    int st = 1, dr = n;
    while(st <= dr){
        int mid = (st+dr)/2;
        cout << "? " << mid;
        cout << endl;
        cin >> val;
        if(val == 0){
            cout << "= " << mid;
            cout << endl;
            return 0;
        }
        if(val == -1){
            st = mid+1;
        }else{
            dr = mid-1;
        }
    }
    return 0;
}
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