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安装,卸载,连接
查看>>
MySQL安装之没有配置向导
查看>>
mysql安装出现 conflicts with mysql*的解决办法
查看>>
mysql安装卡在最后一步解决方案(附带万能安装方案)
查看>>
mysql安装和启动命令小结
查看>>
Mysql安装教程(命令行)
查看>>
mysql安装版安装
查看>>
MySQL安装配置教程(非常详细),从零基础入门到精通,看完这一篇就够了
查看>>
mysql安装配置简介
查看>>
MySQL定义和变量赋值
查看>>
mysql定时任务事件清理单表数据
查看>>
MySQL定时器Events
查看>>
Mysql定时备份脚本
查看>>
mysql实战01|基础架构:一条SQL查询语句是如何执行的?
查看>>
Mysql实战之数据备份
查看>>
MySQL实战教程:从小白到大神的进阶之路!
查看>>
mysql实现成绩排名
查看>>
Mysql客户端中文乱码问题解决
查看>>
mysql客户端工具使用
查看>>
MySQL密码忘记,怎么办?
查看>>