哈希表是一种高效的数据结构。本文分五个部分：首先提出了哈希表的优点，其次介绍了它的基础操作，接着从简单的例子中作了效率对比，指出其适用范围以及特点，然后通过例子说明了如何在题目中运用哈希表以及需要注意的问题，最后总结全文。-Hash table is an efficient data structure. This article is divided into five parts: first put forward the merits of the hash table, followed by introduction of the basis of its operation, and then from the simple example of the efficiency of contrast were made, pointing out that its scope and characteristics, and then through the examples to illustrate how the title the use of hash table and the need to pay attention to the issue of the full text of the final summing up.