zp1439.cpp

一个acm题目系统会自动删除debug和release目录

//---------------------------------------------------------------------------

#pragma hdrstop

//---------------------------------------------------------------------------

#pragma argsused
#include <iostream.h>
#include <iomanip.h>
#include <math.h>
int main(int argc, char* argv[])
{
  int x1,y1,z1,x2,y2,z2,x3,y3,z3;
  double d1,d2,d3,l,s,r,R,x;
  cout<<setiosflags(ios::fixed)<<setprecision(3);
  while (cin>>x1>>y1>>z1>>x2>>y2>>z2>>x3>>y3>>z3)
  {
    d1=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)+(z1-z2)*(z1-z2));
    d2=sqrt((x2-x3)*(x2-x3)+(y2-y3)*(y2-y3)+(z2-z3)*(z2-z3));
    d3=sqrt((x3-x1)*(x3-x1)+(y3-y1)*(y3-y1)+(z3-z1)*(z3-z1));

    l=d1+d2+d3;
    s=sqrt(l*(l/2-d1)*(l/2-d2)*(l/2-d3)/2);
    r=2*s/l;
    R=d1*d2*d3/(s*4);
    x=r*r/(R*R);
    cout<<x<<endl;
  }
  return 0;
}
//---------------------------------------------------------------------------