用Ｃ++语言实现的关于已知长和宽的矩形，以及众多半径不同的圆形，运用贪心策略摆放尽量多的圆形在矩形中-With C++ Language on the known length and width of the rectangle, as well as many different circular radius using the greedy strategy of placing as many as possible in the rectangle in a circular