zoukankan      html  css  js  c++  java
  • [ACM_图论] ZOJ 3708 [Density of Power Network 线路密度,a->b=b->a去重]

    The vast power system is the most complicated man-made system and the greatest engineering innovation in the 20th century. The following diagram shows a typical 14 bus power system. In real world, the power system may contains hundreds of buses and thousands of transmission lines.

    Network topology analysis had long been a hot topic in the research of power system. And network density is one key index representing the robustness of power system. And you are asked to implement a procedure to calculate the network density of power system.

    The network density is defined as the ratio between number of transmission lines and the number of buses. Please note that if two or more transmission lines connecting the same pair of buses, only one would be counted in the topology analysis.

    Input

    The first line contains a single integer T (T ≤ 1000), indicating there are T cases in total.

    Each case begins with two integers N and M (2 ≤ NM ≤ 500) in the first line, representing the number of buses and the number of transmission lines in the power system. Each Bus would be numbered from 1 to N.

    The second line contains the list of start bus number of the transmission lines, separated by spaces.

    The third line contains the list of corresponding end bus number of the transmission lines, separated by spaces. The end bus number of the transmission lines would not be the same as the start bus number.

    Output

    Output the network density of the power system in a single line, as defined in above. The answer should round to 3 digits after decimal point.

    Sample Input

    3
    3 2
    1 2
    2 3
    2 2
    1 2
    2 1
    14 20
    2 5 3 4 5 4 5 7 9 6 11 12 13 8 9 10 14 11 13 13
    1 1 2 2 2 3 4 4 4 5 6 6 6 7 7 9 9 10 12 14
    

    Sample Output

    0.667
    0.500
    1.429
    

    Author: WANG, Yelei
    Contest: The 10th Zhejiang Provincial Collegiate Programming Contest

    题目大意:每个样例第一行是公交车的数目与路线的数目,第二行是公交车起点,第三行是终点,从a->b与b->a是同一条路线,计算总路线与车辆数目的比值

    解题思路:水题,不解释。

     1 #include<iostream>
     2 #include<algorithm>
     3 #include<string.h>
     4 #include<stdio.h>
     5 #include<set>
     6 using namespace std;
     7 int main(){
     8     int T;
     9     cin>>T;
    10     while(T--){
    11         int N,M;
    12         cin>>N>>M;
    13         int start[505],end[505];
    14         for(int i=0;i<M;i++)
    15             cin>>start[i];
    16         for(int i=0;i<M;i++)
    17             cin>>end[i];
    18 
    19         int curM=M;
    20         for(int i=0;i<M-1;i++){
    21             for(int j=i+1;j<M;j++){
    22                 if((start[i]==start[j] && end[i]==end[j])
    23                 ||(start[i]==end[j] && end[i]==start[j])){
    24                     curM--;
    25                     break;
    26                 }
    27             }
    28         }
    29 
    30         printf("%.3lf
    ",curM/(1.0*N));
    31     }return 0;
    32 
    33 }
  • 相关阅读:
    vmware克隆Centos6.4虚拟机网卡无法启动问题
    mysql错误:Statement violates GTID consistency
    /etc/vsftpd.conf详解
    Linux /etc/fstab文件
    sudo命令详解
    linux fack 文件系统修复命令
    ORA-01502: 索引或这类索引的分区处于不可用状态
    Oracle 完整性约束错误
    linux下部署redis
    Python 发送邮件案例
  • 原文地址:https://www.cnblogs.com/zjutlitao/p/3590414.html
Copyright © 2011-2022 走看看