Submission #396584

#	Time	Username	Problem	Language	Result	Execution time	Memory
396584		Sohsoh84	Guess the number (BOI20_guess)	C++14	100 / 100	3 ms	304 KiB

Guess

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

#define all(x)                      (x).begin(),(x).end()
#define X                           first
#define Y                           second
#define sep                         ' '
#define debug(x)                    cerr << #x << ": " <<  x << endl;

const ll MAXN = 1e6 + 10;
const ll INF = 8e18;
const ll MOD = 1e9 + 7; // 998244353; // 1e9 + 9;

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);	
	int n;
	cin >> n;
	int L = 1, R = n;
	while (L <= R) {
		int mid = (L + R) >> 1;
		cout << "? " << mid << endl;
		int ans;
		cin >> ans;
		if (ans == 0) return cout << "= " << mid << endl, 0;
		else if (ans == 1) R = mid - 1;
		else L = mid + 1;
	}	

	return 0;
}

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