Submission #701644

#	Time	Username	Problem	Language	Result	Execution time	Memory
701644		US3RN4M3	Colors (BOI20_colors)	C++17	0 / 100	1 ms	300 KiB

Colors

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
bool ask(ll pos) {
	pos++;
	cout << "? " << pos << endl;
	bool res; cin >> res;
	return res;
}
main() {
	ll n; cin >> n;
	bool parity = true;
	ll lo = 1, hi = n;
	ll pos = (n - 1) / 3;
	ask(pos);
	while(lo != hi) {
		ll mid = (lo + hi - 1) / 2;
		if(parity) {
			pos += mid;
		} else {
			pos -= mid;
		}
		parity = !parity;
		if(ask(pos)) {
			hi = mid;
		} else {
			lo = mid + 1;
		}
	}
	cout << "= " << lo << endl;
}

Compilation message (stderr)

Colors.cpp:10:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   10 | main() {
      | ^~~~

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