제출 #701644

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
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;
}

컴파일 시 표준 에러 (stderr) 메시지

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

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