문제: https://www.acmicpc.net/problem/2681 문제Rancher Joel has a tract of land in the shape of a convex quadrilateral that he wants to divide among his sons Al, Bob, Chas and Dave, who wish to continue ranching on their portions, and his daughter Emily, who wishes to grow vegetables on her portion.The center of the tract is most suitable for vegetable farming so Joel decides to divide the land by d..