zoj 2459 Pyramids

给出四面体的六条楞，求体积，欧拉四面体公式   poj2208用这个公式死活过不了，难道是因为用SPJ了么 T T 。。

 

#include <queue>#include <stack>#include <math.h>#include <stdio.h>#include <stdlib.h>#include <iostream>#include <limits.h>#include <string.h>#include <string>#include <algorithm>using namespace std;//计算四面体体积，欧拉四面体公式 //a=OA，b=OB，c=OC, l=AB, m=BC, n=CA double v_4mianti(double a,double b,double c,double l,double n,double m){return sqrt(4.0*a*a*b*b*c*c-a*a*(b*b+c*c-m*m)*(b*b+c*c-m*m)-b*b*(c*c+a*a-n*n)*(c*c+a*a-n*n)-c*c*(a*a+b*b-l*l)*(a*a+b*b-l*l) +(a*a+b*b-l*l)*(b*b+c*c-m*m)*(c*c+a*a-n*n))/12.0;}int main(){double a,b,c,m,n,l;while( ~scanf("%lf%lf%lf%lf%lf%lf",&a,&b,&c,&l,&n,&m) ){double s = v_4mianti(a,b,c,l,n,m);printf("%.4lf/n",s);}return 0;}