int compare(int *x, int *y)
{
	if (*x > *y) return 1;
	if (*x < *y) return -1;
	return 0;
}


double getarea(int a, int b, int c)
{ double x1, y1, x2, y2, x3, y3;
	x1 = d * cos(a * alph);
	y1 = d * sin(a * alph);
	x2 = d * cos(b * alph);
	y2 = d * sin(b * alph);
	x3 = d * cos(c * alph);
	y3 = d * sin(c * alph);

return fabs(x1 * y3 + x2 * y1 + x3 * y2 - x1 * y2 - x2 * y3 - x3 * y1) / 2;
}

main :

		scanf("%ld%ld%ld%ld", &d, &n, &c, &g);
		d >>= 1;
		alph = 2 * pi / n;
		for (i = 0; i < c; i ++)
			cc[i] = (__int64(g) * i) % n;
qsort(cc, c, sizeof(cc[0]), (int(*)(const void*, const void*)) compare);

• 默认0点坐标为(d,0) (2) Bluebird 2005-07-21 21:03:22
• wrong! (691) frkstyc 2005-07-21 21:03:36
  • if you find out the problem yourself perhaps you will kill yourself (0) frkstyc 2005-07-21 21:04:41
  • where ............ (0) Bluebird 2005-07-21 21:04:41
    • d>>=1,what if d is odd?????????????????????????????????????????????????? (0) frkstyc 2005-07-21 21:05:06
      • 我靠..................................................... (0) Bluebird 2005-07-21 21:05:45
        • 让我撞死吧，豆腐！！！！！！ (0) Bluebird 2005-07-21 21:07:12
          • ft.. (0) frkstyc 2005-07-21 21:07:50
            • sign........怎么还wa......不会是出现精度问题了吧........ (0) Bluebird 2005-07-21 21:22:18