[UVA][幾何][線段] 866 - Intersecting Line Segments
Intersecting line segments
Background
In a 2-D Cartesian space, a straight line segment A is defined
by two points A0=(x0,y0), A1=(x1,y1).
The intersection of line segments A and B (if there is one),
together with the initial four points, defines four new li...
