buaa 1033 Easy Problem(三分)(简单)

#include<iostream>
#include<cstdio>
#include<cmath>
#define eps 1e-8
using namespace std;

typedef struct node
{
    double x,y,z;
}node;
node l,r,p;

double dist(node a,node b)
{
    return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y)+(a.z-b.z)*(a.z-b.z));
}

int sgn(double a)
{
    return (a>eps)-(a<-eps);
}

node getmid(node a,node b)
{
    node mid;
    mid.x=(a.x+b.x)/2;
    mid.y=(a.y+b.y)/2;
    mid.z=(a.z+b.z)/2;
    return mid;
}

node search()
{
    node mid,midmid;
    while(sgn(dist(l,r))>0)
    {
        mid=getmid(l,r);
        midmid=getmid(mid,r);
        if(dist(p,mid)<dist(p,midmid))
            r=midmid;
        else
            l=mid;
    }
    return r;
}

int main()
{
    int t;node k;
    cin>>t;
    for(int i=1;i<=t;i++)
    {
        cin>>p.x>>p.y>>p.z;
        cin>>l.x>>l.y>>l.z;
        cin>>r.x>>r.y>>r.z;
        k=search();
        printf("Case %d: %.2lf\n",i,dist(k,p));
    }
    return 0;
}

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