Submission #951166

#	Time	Username	Problem	Language	Result	Execution time	Memory
951166		Soshi85	Guess the number (BOI20_guess)	C++17	100 / 100	2 ms	596 KiB

Guess

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")//,bmi,bmi2,lzcnt,popcnt
#include<bits/stdc++.h>

using namespace std;
using ll = long long;
using pii = pair<ll, ll>;
using piii = pair<ll, pii>;

#define pb              push_back
#define F               first
#define S               second
#define len(x)          (int)x.size()
#define all(x)          x.begin(),x.end()
#define file            freopen("connect.in", "r", stdin);freopen("connect.out", "w", stdout);
#define kill(x)         {cout << x << '\n'; continue;}
#define int             long long
	
const int maxn = 3e3 + 5, maxm = 2e5, LG = 20, MOD = 1e9+7;// 998244353
const ll inf =  6e18;

//priority_queue< int, vector<int>, greater<int>> pq;  min heap
//priority_queue< int, vector<int>,  less<int> > pq;   max heap

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int n;
signed main() {
	ios::sync_with_stdio(0), cin.tie(0);
	
	cin >> n;
	int l = 1, r = n+1;

	while(true) {
		int mid = (l + r) >> 1;
		cout << "? " << mid << endl;
		int x;
		cin >> x;
		if(x == -1) l = mid;
		else if(x == 1) r = mid;
		else if(x == 0) {cout << "= " << mid << endl; break;}
		
	}

}

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