作为AS连锁超市，本文直接介绍了连锁超市的原状和存在的问题，具有指导意义。-As AS supermarket chains, the paper describes the supermarket chain directly undisturbed and problems, guiding significance.

假设树上第个结点所含的数据元素为一个字母，并用链式存储结构为树的存储结构，试写一个按凹入表达方式打印一棵树的算法-Assumes that a tree each node has data elements of a letter, and chain storage structure for the storage structure of tree, try to write a press recessed expression print a tree algorithm