Submission #537116

#	Time	Username	Problem	Language	Result	Execution time	Memory
537116		rainboy	별자리 2 (JOI14_constellation2)	C11	55 / 100	9070 ms	340 KiB

constellation2

#include <stdio.h>
#include <string.h>

#define N	3000

int xx[N], yy[N], cc[N];

long long cross(int i, int j, int k) {
	return (long long) (xx[j] - xx[i]) * (yy[k] - yy[i]) - (long long) (xx[k] - xx[i]) * (yy[j] - yy[i]);
}

int main() {
	static int kk[3], ll[3];
	int n, i, j, k;
	long long ans;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		scanf("%d%d%d", &xx[i], &yy[i], &cc[i]);
	ans = 0;
	for (i = 0; i < n; i++)
		for (j = i + 1; j < n; j++) {
			memset(kk, 0, sizeof kk);
			memset(ll, 0, sizeof ll);
			for (k = 0; k < n; k++)
				if (k != i && k != j) {
					if (cross(i, j, k) < 0)
						kk[cc[k]]++;
					else
						ll[cc[k]]++;
				}
			ans += (long long) kk[(cc[i] + 1) % 3] * kk[(cc[i] + 2) % 3] * ll[(cc[j] + 1) % 3] * ll[(cc[j] + 2) % 3];
		}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

constellation2.c: In function 'main':
constellation2.c:17:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
constellation2.c:19:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   scanf("%d%d%d", &xx[i], &yy[i], &cc[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 0 / 45