deep-copy

二叉树的先序遍历。采用递归实现。释放资源时用了后序遍历。(Preorder traversal of a binary tree. Recursive implementation. Release resources used after preorder.)

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.)

本文讨论了动态规划这一思想的核心内容和其基本特点，探讨了动态规划思想的适用范围，动态规划子问题空间和递推关系式确立的一般思路。(This paper discusses the dynamic planning this thought core content and its basic characteristics, this paper discusses the dynamic planning idea, the applicable scope of the dynamic programming problem space and son recursive formula of the establishment of general thoughts. )

A*算法通过启发式探索下一结点，逐步逼近目标结点，且使得路径最短。(A* algorithm heuristic to explore the next node, and gradually approaching the target node, and that the shortest path.)

这是一个堆排序的算法源程序，算法被单独写成一个函数，希望对大家有用(This is a heap sort algorithm source code, algorithms are written as a separate function, we hope to be useful)

使用C语言完成党的霍夫曼编码，主要使用树的数据结构，作为巩固数据结构的练习(Using the C language to complete the party' s Huffman coding, the main use of the tree data structure, data structure as a consolidation exercise)

利用二叉平衡树进行数据排序。这里采用的数据结构是指针。(The use of balanced binary tree sort the data. The data structure used here is a pointer.)

八皇后算法，用的是最简单的穷举法，在VC++6.0上编写的。(Eight Queens algorithm, using the simplest method of exhaustion, in VC++6.0 written on.)

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)

经典算法巴斯卡三角的简单实现，vs2010编译通过(Simple implementation of the classic algorithm Pascal triangle, vs2010 compiled by)