Talk:Algorithm Implementation/Geometry/Convex hull/Monotone chain

While the C code was taken from an external source (Perl module) with different licensing, that was done by the author, so all is well.

The C++ version says:

// Returns a list of points on the convex hull in counter-clockwise order. // Note: the last point in the returned list is the same as the first one.

However it has an early-termination test for 3 or fewer input points, and in this case it ensures neither the ordering nor the first-last duplication.