题目描述：

题解：

直线判交没啥好说的……

（不要用g++，一定要用c++）

代码：

#include
      
       #include
       
        #include
        
         #include
         
          using namespace std;const double eps = 1e-8;int dcmp(double x){    if(fabs(x)<=eps)return 0;    return x>0?1:-1;}struct Point{    double x,y;    Point(){}    Point(double x,double y):x(x),y(y){}    Point operator +(const Point&a)const{
    return Point(x+a.x,y+a.y);}    Point operator -(const Point&a)const{
    return Point(x-a.x,y-a.y);}    Point operator *(const double&a)const{
    return Point(x*a,y*a);}    double operator ^(const Point&a)const{
    return x*a.y-y*a.x;}}a,b,c,d;typedef Point Vector;struct Line{    Point p;    Vector v;    Line(){}    Line(Point p,Vector v):p(p),v(v){}}s1,s2;int n;void work(){    scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&a.x,&a.y,&b.x,&b.y,&c.x,&c.y,&d.x,&d.y);    s1 = Line(a,b-a),s2 = Line(c,d-c);    if(!dcmp(s1.v^s2.v))    {        if(!dcmp(s1.v^(s2.p-s1.p)))puts("LINE");        else puts("NONE");    }else    {        double t = fabs(((s2.p-s1.p)^s2.v)/(s1.v^s2.v));        Point now = s1.p+s1.v*t;        printf("POINT %.2lf %.2lf\n",now.x,now.y);    }}int main(){    puts("INTERSECTING LINES OUTPUT");    scanf("%d",&n);    while(n--)work();    puts("END OF OUTPUT");    return 0;}