Submission #858828

#	Time	Username	Problem	Language	Result	Execution time	Memory
858828		maks007	Colors (BOI20_colors)	C++14	0 / 100	1 ms	444 KiB

Colors

#include "bits/stdc++.h"

using namespace std;

signed main () {
	int n;
	cin >> n;
	cout << "? 1" << endl;
	int x;
	cin >> x;
	int r = n+2;
	for(int l = 1, f = 1;; f = 1 - f) {
		if(l + 2 >= r) break;
		if(f) {
			r -= 2;
			cout << "? " << r << endl;
			cin >> x;
			if(x == 0) {
				if(x == 0 && r == n) {
					cout << "= " << n << endl;
					return 0;
				}
				cout << "? " << r - (r - l + 1) << endl;
				cin >> x;
				if(x == 1) {
					cout << "= " << (r - l + 1) << endl;
				}else {
					cout << "= " << (r - l + 1) + 1 << endl;
				}
				return 0;
			}
		}else {
			l += 2;
			cout << "? " << l << endl;
			cin >> x;
			if(x == 0) {
				cout << "? " << l + (r - l + 1) << endl;
				cin >> x;
				if(x == 1) {
					cout << "= " << (r - l + 1) << endl;
				}else {
					cout << "= " << (r - l + 1) + 1 << endl;
				}
				return 0;
			}
		}
	}
	cout <<"= 1" << endl;
	return 0;
}

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