商品货架管理：商品货架可以看成一个栈，栈顶商品的生产日期最近，上货时，需要倒货架，以保证生产日期较近的商品在较下的位置，用队列和栈最为周转，实现上述管理过程(Goods shelves can be seen as a stack, the stack of goods production date recently on the goods, need to pour the shelves, to ensure production date near goods in the lower, with the queue and stack the turnover, realizing the management process)