Submission #858735

#	Time	Username	Problem	Language	Result	Execution time	Memory
858735		maks007	Colors (BOI20_colors)	C++14	0 / 100	0 ms	436 KiB

Colors

#include "bits/stdc++.h"
 
using namespace std;
 
#define int long long
 
signed main () {
	int n;
	cin >> n;
	int l = 1, r = n+1, f = 1;
	cout << "? " << 1 << endl;
	int x;
	cin >> x;
	set <int> s;
	for(int i = 0; i < n; i ++) s.insert(i+1);
	s.erase(1);
	if(n > 64) {
		return 0;
	}
	while(1) {
		if(l+1>=r)break;
		if(f == 1) {
			r --;
			cout << "? " << r << endl;
			cin >> x;
			if(x == 0) {
				assert(r-l<n);
				cout <<"= " << r-l+1 << endl;
				return 0;
			}
			f = -1;
		}else {
			l ++;
			cout << "? " << l << endl;
			cin >> x;
			if(x == 0) {
				assert(r-l<n);
				cout <<"= " << r-l+1 << endl;
				return 0;
			}
			f=1;
		}
	}
	cout << "= 0" << endl;
	return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 33