Submission #549291

#	Time	Username	Problem	Language	Result	Execution time	Memory
549291		blue	Triangles (CEOI18_tri)	C++17	35 / 100	636 ms	308 KiB

tri

#include "trilib.h"
#include <vector>
#include <set>
using namespace std;

using vi = vector<int>;
#define sz(x) int(x.size())

int main()
{
	int n = get_n();

	set<int> hull;

	for(int i = 1; i <= n; i++)
	{
		for(int j = 1; j <= n; j++)
		{
			if(i == j) continue;

			bool works = 1;
			for(int k = 1; k <= n; k++)
			{
				if(k == i || k == j) continue;

				works &= is_clockwise(i, j, k);
			}

			if(works)
			{
				hull.insert(i);
				hull.insert(j);
			}
		}
	}

	give_answer(sz(hull));
}

• Subtask 1: 15 / 15
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 20 / 20
• Subtask 5: 0 / 25