说明：  此函数是三维装箱问题里的一个子函数，他的功能是将一个长方体物品放到一个平面序列后，返回装入后的平面序列和所用的集装箱数目。
(This function is three-dimensional packing problem in a Function, and his function is a rectangular items into a flat sequence, after the plane back into the sequence and number of used containers.)