OJ-Problems-Source/HDOJ/4617_autoAC.cpp

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#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string.h>
#include <set>
#include <map>
#include <vector>
#include <queue>
#include <string>
#include <math.h>
using namespace std;
const double eps = 1e-8;
int sgn(double x)
{
if(fabs(x) < eps)return 0;
if(x < 0)return -1;
else return 1;
}
struct Point3D
{
double x,y,z;
Point3D(double _x = 0,double _y = 0,double _z = 0)
{
x = _x;
y = _y;
z = _z;
}
Point3D operator -(const Point3D &b)const
{
return Point3D(x-b.x,y-b.y,z-b.z);
}
Point3D operator ^(const Point3D &b)const
{
return Point3D(y*b.z-z*b.y,z*b.x-x*b.z,x*b.y-y*b.x);
}
double operator *(const Point3D &b)const
{
return x*b.x+y*b.y+z*b.z;
}
void input()
{
scanf("%lf%lf%lf",&x,&y,&z);
}
};
double Norm(Point3D p)
{
return sqrt(p*p);
}
double calc(Point3D a,Point3D k1,Point3D b,Point3D k2)
{
Point3D tmp = k1^k2;
return fabs(tmp*(a-b))/sqrt(tmp*tmp);
}
struct Node
{
Point3D o,p1,p2;
void input()
{
o.input();
p1.input();
p2.input();
}
}node[50];
int main()
{
int T;
int n;
scanf("%d",&T);
while(T--)
{
scanf("%d",&n);
for(int i = 0;i < n;i++)
node[i].input();
bool flag = false;
double Min = 1e20;
for(int i = 0;i < n;i++)
for(int j = i+1;j < n;j++)
{
if(flag)break;
double r1 = sqrt((node[i].p1-node[i].o)*(node[i].p1-node[i].o));
double r2 = sqrt((node[j].p1-node[j].o)*(node[j].p1-node[j].o));
Point3D k1 = (node[i].p1-node[i].o)^(node[i].p2-node[i].o);
Point3D k2 = (node[j].p1-node[j].o)^(node[j].p2-node[j].o);
if(sgn(Norm(k1^k2))==0)
{
if(sgn( Norm( k1^(node[i].o-node[j].o)) ) == 0)
{
if(sgn(r1-r2) == 0)
{
flag = true;
break;
}
else continue;
}
else
{
double dd = (k1*(node[i].o-node[j].o))/Norm(k1);
double d = sqrt( Norm(node[i].o-node[j].o)*Norm(node[i].o-node[j].o) - dd*dd );
if(d > fabs(r1-r2) &&d < fabs(r1+r2))
{
flag = true;
break;
}
Min = min(Min,d-r1-r2);
}
continue;
}
double d = calc(node[i].o,k1,node[j].o,k2);
if(d < r1 + r2 -eps)
{
flag = true;
break;
}
Min = min(Min,d-r1-r2);
}
if(flag || sgn(Min)<=0)printf("Lucky\n");
else printf("%.2lf\n",Min);
}
return 0;
}