博客
关于我
HDU 1102 Constructing Roads
阅读量:131 次
发布时间:2019-02-27

本文共 3449 字,大约阅读时间需要 11 分钟。

Constructing Roads

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)

Total Submission(s): 1914    Accepted Submission(s): 628

Problem Description
There are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to each other. We say two village A and B are connected, if and only if there is a road between A and B, or there exists a village C such that there is a road between A and C, and C and B are connected.
We know that there are already some roads between some villages and your job is the build some roads such that all the villages are connect and the length of all the roads built is minimum.
 

 

Input
The first line is an integer N (3 <= N <= 100), which is the number of villages. Then come N lines, the i-th of which contains N integers, and the j-th of these N integers is the distance (the distance should be an integer within [1, 1000]) between village i and village j.
Then there is an integer Q (0 <= Q <= N * (N + 1) / 2). Then come Q lines, each line contains two integers a and b (1 <= a < b <= N), which means the road between village a and village b has been built.
 

 

Output
You should output a line contains an integer, which is the length of all the roads to be built such that all the villages are connected, and this value is minimum.
 

 

Sample Input
30 990 692990 0 179692 179 011 2
 

 

Sample Output
179
 

 

 解题:
        还是用克鲁斯卡尔算法。题目大意是:有N个村庄,给定我们每个村庄之间的距离,而两个村庄可以间接相连。然后告诉我们原本有几个村庄已经相连有路相通。要让我们求还要建多长的路,最小的。可以用最小生成树,先把给定的已相连的村庄之间的权值赋为0,其余跟求最小生成树一样。

转载地址:http://ucid.baihongyu.com/

你可能感兴趣的文章
mysql 存储过程 注入_mysql 视图 事务 存储过程 SQL注入
查看>>
MySQL 存储过程参数:in、out、inout
查看>>
mysql 存储过程每隔一段时间执行一次
查看>>
mysql 存在update不存在insert
查看>>
Mysql 学习总结(86)—— Mysql 的 JSON 数据类型正确使用姿势
查看>>
Mysql 学习总结(87)—— Mysql 执行计划(Explain)再总结
查看>>
Mysql 学习总结(88)—— Mysql 官方为什么不推荐用雪花 id 和 uuid 做 MySQL 主键
查看>>
Mysql 学习总结(89)—— Mysql 库表容量统计
查看>>
mysql 实现主从复制/主从同步
查看>>
mysql 审核_审核MySQL数据库上的登录
查看>>
mysql 导入 sql 文件时 ERROR 1046 (3D000) no database selected 错误的解决
查看>>
mysql 导入导出大文件
查看>>
MySQL 导出数据
查看>>
mysql 将null转代为0
查看>>
mysql 常用
查看>>
MySQL 常用列类型
查看>>
mysql 常用命令
查看>>
Mysql 常见ALTER TABLE操作
查看>>
MySQL 常见的 9 种优化方法
查看>>
MySQL 常见的开放性问题
查看>>