Submission #16976

# Submission time Handle Problem Language Result Execution time Memory
16976 2015-11-03T06:10:46 Z taehoon1018 초록색 삼각형 (YDX13_green) C++
0 / 1
0 ms 1084 KB
#include <stdio.h>

double area(int x1, int y1, int x2, int y2, int x3, int y3)
{
	double res = (x1*y2 + x2*y3 + x3*y1 - x2*y1 - x3*y2 - x1*y3)/(double)2;
	if (res < 0)
		res = -res;

	return res;
}
int main(void)
{
	int x[2001] = { 0 };
	int y[2001] = { 0 };
	int N = 0,count = 0;
	double sum = 0;

	scanf("%d", &N);
	for (int i = 0; i < N; i++)
	{
		scanf("%d%d", &x[i], &y[i]);
	}
	if (N < 3)
	{
		printf("%.12f", 0);
		return 0;
	}
	for (int a = 0; a < N-2;a++)
	{
		for (int b = a+1; b < N - 1;b++)
		{
			for (int c = b+1; c < N;c++)
			{
				sum += area(x[a], y[a], x[b], y[b], x[c], y[c]);
				count++;
			}
		}
	}

	printf("%.12f\n", sum/count);

	return 0;
}
# Verdict Execution time Memory Grader output
1 Correct 0 ms 1084 KB Output is correct
2 Correct 0 ms 1084 KB Output is correct
3 Incorrect 0 ms 1084 KB Output isn't correct
4 Halted 0 ms 0 KB -