How is that hint of any use?
Question is of computational geometry and a little research would make people land on line sweep algorithm but after that part is intuitive so this is not much of meaning in this context, the codes are exactly same so that means maybe mutual friends or ideone.
Ideone cases have bigger reach and a few months back it became a very big issue and people who were working hard but solving problems (even a few 6* coders) got hit.
Rest forums besides stack overflow i don’t use.(so can’t comment)
As codechef is celebrating it’s 11th birthday,this time March challenge has double the no. of usual prizes, so codechef should also give double of regular punishment to those who indulge in plagrism this time.