stack

二查树遍历文件，可以用于程序测试，有喜欢的朋友要多多使用哦(Two check tree traversal file that can be used for program testing)

大二时做的一个数据结构的课程设计，用2-3树实现的图书馆管理系统，只是控制台程序，没有很好的图形界面。包括管理员、读者。管理员功能有：采编入库、查看图书、查看读者、删除读者。读者功能有：借书、还书、预约、查找等等。。功能全面。包括注册账号，登录需要账号密码。(Sophomore to do a data structure of the curriculum design, with 2-3 tree implementation of library management system, but the console program, not a good graphical interface. Including administrators, readers. Administrator functions include: editing storage, check books, check readers, delete readers. Reader functions: library, book, booking, search and so on. . Full-featured. Including the registration account, login account password required. )

数据结构学习中提供的不错的源码，一个哈夫曼树类，利用了链队列存储结构。压缩包中有七个文件。(Data structure provided a good learning source, a Huffman tree class, the use of the chain queue storage structure. There are seven compressed file.)

一．问题描述 对2006年度全国80多个城市的每天空气质量状况进行查询、排序等操作。 空气质量状况对象包括城市代码、城市名称、首要污染物、污染指数、污染物级别、空气状况、年、月、日 二、实验要求 1． 普通查询：输入城市名称和城市代码，分别查询该城市每天、每周、每月、每季度和全年的空气质量状况 例子：查询太原市2006年第8周的空气质量状况 2．统计查询： （1）输入城市名称和城市代码，分别查询该城市每周、每月、每季度和全年的空气质量为优、良、轻微污染、轻度污染、重污染的天数 例子：查询石家庄市2006年第2季度空气质量为轻微污染的总天数 （2）根据时间查询空气质量状况：输入周编号、月编号、季度编号或年编号，以及空气质量为优、良、轻微污染、轻度污染、重污染的天数，查找相应的城市名称 例子：查询2006年5月，空气被轻度污染3天以上的城市有哪些？ 3．排序查询 （1）输入周编号、月编号、季度编号或年编号，查询城市空气质量的排行榜 例子：查询2006年第6周，全国空气平均质量最好的前20个城市为哪些？ 三、数据文件 Data.txt(one. Problem Description of the air quality day in 2006 more than 80 cities nationwide query, sorting and other operations. Air Quality objects include city code, city name, the primary pollutant, pollution index, contaminant level, air condition, year, month, day two, experimental requirements 1. General Queries: Enter a city name and city codes, each query in the city daily, weekly, monthly, quarterly example air quality and full year: Queries air quality in Taiyuan first eight weeks of 2006 2. Statistical inquiry: (1) enter a city name and city codes, each query in the city weekly, monthly, quarterly and annual air quality as excellent, good, slight pollution, light pollution, heavy pollution days example: inquiry Shijiazhuang City in 2006 second quarter, the air quality is the total number of days a slight pollution (2) according to time of the query air quality conditions: enter the week number, month number, quarter number or in number, and the air quality is excellent, good, sli)

数据结构（严蔚敏版）中哈夫曼树的操作程序源代码(Of data structure (Yan Wei Min version) operating procedures in the source code Huffman tree)

本实验设有一个线性表，分别实现数组结构存储的原地逆置。为数据结构课程必做实验。(This experiment has a linear form, respectively, to achieve the storage array structure in situ reverse home. For the data structure courses will do the experiment.)

实现经典问题老鼠迷宫，并用坐标将路径显示出来(Achieve classic problem rat maze, and coordinate with the path displayed)

另外一个可以实现线性表的程序，简单的操作，值得初学者的借鉴(Another table can achieve a linear process, simple to operate, it is worth drawing beginners)

给定一个带权的无向连通图,如何选取一棵生成树,使树上所有边上权的总和为最小(Given a weighted undirected connected graph, how to select a spanning tree to minimize the sum of all the upper bounds on the tree)

清华大学出版社，数据结构简明教程李春葆著，第四章源文件(Tsinghua University press, a brief course on data structure, Li Chunbao, fourth chapters)