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数据结构课程作业，查找算法。用哈希算法下实行查找(Data structure course work, search algorithm. Under the hash algorithm used to find)

基于数据结构的图书管理系统，基本功能都有，可以拿来作为数据结构的课程设计(Based library management system data structures, basic function, can be used as a data structure of the curriculum design)

纯C语言写的小型通用数据库，一个C数据结构组科技小组的作品，附有开发思路PPT，这可是一个宝贵的资源哦，更底层的东西，运行于DOS提示符，可以新建数据库等操作。C的编程高手们值得参考一下。 (Pure C language to write a small general-purpose database, a data structure C Group Technology Group works to develop ideas with PPT, this is a valuable resource Oh, and the bottom of things, running on the DOS prompt, you can operate a new database. C programming masters worthy of reference.)

双链表的定义和插入算法，双链表的定义，删除，插入和查找算法(Doubly linked list of definitions and insertion algorithm, the definition of double-linked list, delete, insert, and search algorithm)

演示进程调度算法 使用的链表 包涵7个功能 4个算法(Process Scheduling Algorithm Demo )

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)

已知线性表中的元素以值递增有序排列，并以单链表作存储结构。试写一高效的算法，删除表中所有值大于mink且小于maxk的元素（若表中存在这样的元素）同时释放被删结点空间，并分析你的算法的时间复杂度（注意：mink和maxk是给定的两个参变量，它们的值可以和表中的元素相同，也可以不同）。(Known linear elements in the table to the value increments ordered, and a single list for the storage structure. Try to write a highly efficient algorithm to delete all values ​ ​ greater than mink and maxk elements smaller than (if there is such an element in the table) while the release of the deleted node space, and analyze your time complexity of the algorithm (Note: mink and maxk is given two parameters variables, their values ​ ​ and elements in the table can be the same or different).)

给定n种物品和一背包。物品i的重量是wi>0,价值为vi>0,背包的容量为c。选择装入背包的物品，使得装入背包中物品的总价值最大。(Given n kinds of goods and a backpack. Weight of the item i is wi> 0, the value of vi> 0, knapsack capacity c. Select the items into the backpack, so into the backpack of items in the total value of the maximum.)

1>实现可以随意浏览任一景点的介绍。（功能一） 2>可以给出任意两个景点的最短距离及其路线。（功能二） 3>可以查看任一景点热度，并可以对对所有景点热度（访问次数）进行排序。（功能三） 4>每个景点相关内容从文件读取，实现对文件操作的练习。 (1> implementations can feel free to browse introduce 任一景 points. (Function a) 2> You can give the shortest distance and route between any two attractions. (Function b) 3> You can view Renyi Jing point heat, and heat can all attractions (visits) to be sorted. (Function c) 4> each spot related content file reading, to achieve the file operations exercises.)

单链表的插入。数据结构中的算法小程序。初学者很适用。(Single-linked list insertion. Data structure of algorithm applet. Beginners are applicable.)