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liu
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)
- 2017-04-07 10:58:37下载
- 积分：1
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Poly
多项式相加的数据结构试验·············(Polynomial sum test data structure)
- 2010-12-24 15:11:55下载
- 积分：1
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migong
迷宫问题，利用随机数自动生成迷宫，并自动进行探索。迷宫起点及终点由用户自己设定。(Maze problem, the use of random number automatically generated maze, and automatically explore. The starting point and end point of the maze is set by the user.
双语对照
)
- 2021-04-26 16:48:45下载
- 积分：1
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Figure-topological-sort
说明： 拓扑排序
对一个 有向无环图 G进行拓扑排序，是将G中所有顶点排成一个线性序列，使得图中任
意一对顶点u和v，若u，v ∈E，则u在线性序列中出现在v之前。
通常，这样的线性序列称为满足拓扑次序的序列，简称 拓扑序列 。
注意：
①若将图中顶点按拓扑次序排成一行，则图中所有的有向边均是从左指向右的。
②若图中存在有向环，则不可能使顶点满足拓扑次序。
③一个DAG的拓扑序列通常表示某种方案切实可行。 (Topological sort
In a directed acyclic graph G topological sort, is all vertices will G formed a linear sequence, make diagram post
Meaning a pair of vertex u and v, if u, v ∈ E, then u in linear sequence in which they appear in v before.
Usually, such linear sequence sequence of topological order called meet, abbreviation topology sequence.
Note:
(1) if the diagram according to the topology order line vertices, then figure all from left to right edge are pointing.
(2) if the figure to exist in the ring, is impossible to have the vertex meet topological sequence.
(3) a DAG topological sequence usually expressed some scheme is feasible.
)
- 2011-03-22 17:19:14下载
- 积分：1
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heapSort.cpp.tar
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)
- 2013-12-12 14:52:48下载
- 积分：1
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xianxinglianbiao
c语言编写链式线性表的初始化，创建，插入删除等操作。(c language chained linear table is initialized, create, insert and delete operations.)
- 2013-11-09 14:30:30下载
- 积分：1
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bstree_frame
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.)
- 2013-08-10 16:43:50下载
- 积分：1
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DBSCAN
数据挖掘中聚类算发中基于密度的算法DBSCAN(Hair count data mining clustering algorithm DBSCAN density-based)
- 2011-09-29 09:53:45下载
- 积分：1
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ahuangCD
这个是数据结构课程设计中阿黄的CD的程序代码的工程文件包(This is a data structure curriculum design A yellow CD program code works package)
- 2013-12-21 18:53:00下载
- 积分：1
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american_heritage
USACO中的American heritage，用C++编写，运用了树的遍历知识(the American heritage of USACO, with C++ prepared, using a tree traversal knowledge)
- 2013-07-21 18:31:10下载
- 积分：1
