제출 #1156641

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1156641		Pwo	Colors (BOI20_colors)	C++20	0 / 100	0 ms	416 KiB

Colors

#include <bits/stdc++.h>
using namespace std;
#define int long long

int32_t main() {
	int n; cin >> n;
	int x = (n + 2) / 3;
	int l = 1, r = n, ans;
	cout << "? " << x << endl;
	bool res; cin >> res;
	while (l <= r) {
		int m = (l + r) / 2;
		if (x > m) x -= m;
		else x += m;
		cout << "? " << x << endl;
		cin >> res;
		if (res) ans = m, l = m + 1;
		else r = m - 1;
	}
	cout << ans;
}

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