超煩雑な制御精度と誤差値
//============================================================================
// Name : Firemen barracks.cpp
// Date : 2013/5/9 午後1:40:03
// Author : GCA
//============================================================================
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <climits>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <cctype>
#include <utility>
using namespace std;
#ifdef ONLINE\_JUDGE
#define ll "%lld"
#else
#define ll "%I64d"
#endif
typedef unsigned int uint;
typedef long long int Int;
#define Set(a,s) memset(a,s,sizeof(a))
#define Write(w) freopen(w,"w",stdout)
#define Read(r) freopen(r,"r",stdin)
#define Pln() printf("\\n")
#define I\_de(x,n)for(int i=0;i<n;i++)printf("%d ",x\[i\]);Pln()
#define De(x)printf(#x"%d\\n",x)
#define For(i,x)for(int i=0;i<x;i++)
#define CON(x,y) x##y
#define Pmz(dp,nx,ny)for(int hty=0;hty<ny;hty++){for(int htx=0;htx<nx;htx++){\\
printf("%d ",dp\[htx\]\[hty\]);}Pln();}
#define M 10011
#define PII pair<int,int\>
#define PB push\_back
#define oo INT\_MAX
#define Set\_oo 0x3f
#define Is\_debug true
#define debug(...) if(Is\_debug)printf("DEBUG: "),printf(\_\_VA\_ARGS\_\_)
#define FOR(it,c) for(\_\_typeof((c).begin()) it=(c).begin();it!=(c).end();it++)
#define eps 1e-6
#define deps 1e-1
bool xdy(double x,double y){return x>y+eps;}
bool xddy(double x,double y){return x>y-eps;}
bool xcy(double x,double y){return x<y-eps;}
bool xcdy(double x,double y){return x<y+eps;}
bool xdddy(double x,double y){return fabs(x-y)<eps;}
bool txdddy(double x,double y){return fabs(x-y)<deps;}
int min3(int x,int y,int z){
int tmp=min(x,y);
return min(tmp,z);
}
int max3(int x,int y,int z){
int tmp=max(x,y);
return max(tmp,z);
}
struct point{
double x,y;
}p\[3\];
inline void swap(double &a,double &b){
double tmp=a;a=b;b=tmp;
}
void solve(){
double a1,b1,c1,a2,b2,c2;
double x1=p\[0\].x,y1=p\[0\].y;
double x2=p\[1\].x,y2=p\[1\].y;
double x3=p\[2\].x,y3=p\[2\].y;
double ansx,ansy;
a1=2\*(x2-x1);
b1=2\*(y2-y1);
c1=x1\*x1-x2\*x2+y1\*y1-y2\*y2;
a2=2\*(x3-x1);
b2=2\*(y3-y1);
c2=x1\*x1-x3\*x3+y1\*y1-y3\*y3;
if(((x1==x2&&x2==x3&&y1==y2&&y2==y3))||(x1==x2&&y1==y2)||(x1==x3&&y1==y3)||(x2==x3&&y2==y3)){
printf("無限の可能な位置があります。\\n");
return;
}
if(xdddy((x1-x2)\*(y1-y3),(x1-x3)\*(y1-y2))){
printf("可能な位置はありません。\\n");
return;
}
if(xdddy(a1,0)){
swap(a1,a2);
swap(b1,b2);
swap(c1,c2);
}
double ob=b1,oc=c1,oa=a1;
b1\*=(a2/a1);
c1\*=(a2/a1);
ansy=-(c1-c2)/(b1-b2);
ansx=-(ansy\*ob+oc)/oa;
if((ansx-0.05)<eps&&(ansx+0.05)>eps){
ansx=0.0;
}else{
if(ansx<eps)ansx-=eps;
}
if((ansy-0.05)<eps&&(ansy+0.05)>eps){
ansy=0.0;
}else{
if(ansy<eps)ansy-=eps;
}
printf("等距の位置は(%.1lf, %.1lf)です。\\n",ansx,ansy);
}
int main() {
ios\_base::sync\_with\_stdio(0);
int test;
scanf("%d",&test);
while(test--){
for(int i=0;i<3;i++){
scanf("%lf%lf",&p\[i\].x,&p\[i\].y);
}
solve();
}
}