#include#include#include#include#include#include#define" />

亚洲免费在线-亚洲免费在线播放-亚洲免费在线观看-亚洲免费在线观看视频-亚洲免费在线看-亚洲免费在线视频

UVa753/POJ1087_A Plug for UNIX(網絡流最大流)

系統 1990 0

解題報告

題意:

n個插頭m個設備k種轉換器。求有多少設備無法插入。

思路:

定義源點和匯點,源點和設備相連,容量為1.

匯點和插頭相連,容量也為1.

插頭和設備相連,容量也為1.

可轉換插頭相連,容量也為inf(由于插頭有無限個)

      #include <map>
#include <queue>
#include <cstdio>
#include <vector>
#include <cstring>
#include <iostream>
#include <algorithm>
#define inf 99999999
using namespace std;
int n,m,k,cnt,l[500],mmap[500][500],N[1000];
map<string,int >Map;
int bfs()
{
    memset(l,-1,sizeof(l));
    queue<int>Q;
    Q.push(0);
    l[0]=0;
    while(!Q.empty())
    {
        int u=Q.front();
        Q.pop();
        for(int i=0;i<=cnt;i++)
        {
            if(l[i]==-1&&mmap[u][i])
            {
                l[i]=l[u]+1;
                Q.push(i);
            }
        }
    }
    if(l[cnt]>0)return 1;
    return 0;
}
int dfs(int x,int f)
{
    if(x==cnt)return f;
    int a;
    for(int i=0;i<=cnt;i++)
    {
        if(mmap[x][i]&&l[i]==l[x]+1&&(a=dfs(i,min(f,mmap[x][i]))))
        {
            mmap[x][i]-=a;
            mmap[i][x]+=a;
            return a;
        }
    }
    return 0;
}
int main()
{
    int i,j;
    string a,b;
    cin>>n;
    cnt=1;
    for(i=0;i<n;i++)
    {
        cin>>a;
        N[cnt]=1;//cha
        Map[a]=cnt++;
    }
    cin>>m;
    for(i=0;i<m;i++)
    {
        cin>>a>>b;
        N[cnt]=2;//she
        Map[a]=cnt++;
        if(Map[b]==0)
        {
            N[cnt]=3;//new1
            Map[b]=cnt++;
        }
        int u=Map[a];
        int v=Map[b];
        mmap[u][v]=1;
    }
    cin>>k;
    for(i=0;i<k;i++)
    {
        cin>>a>>b;
        if(Map[a]==0)
        {
            N[cnt]=3;
            Map[a]=cnt++;
        }
        if(Map[b]==0)
        {
            N[cnt]=3;
            Map[b]=cnt++;
        }
        int u=Map[a];
        int v=Map[b];
        mmap[u][v]=inf;
    }
    for(i=1;i<cnt;i++)
    {
        if(N[i]==1)
        {
            mmap[i][cnt]=1;
        }
        if(N[i]==2)
        {
            mmap[0][i]=1;
        }
    }
    int ans=0,t;
    while(bfs())
        while(t=dfs(0,inf))
        ans+=t;
    cout<<m-ans<<endl;
    return 0;
}

    

A Plug for UNIX
Time Limit: ?1000MS ? Memory Limit: ?65536K
Total Submissions: ?13550 ? Accepted: ?4518

Description

You are in charge of setting up the press room for the inaugural meeting of the United Nations Internet eXecutive (UNIX), which has an international mandate to make the free flow of information and ideas on the Internet as cumbersome and bureaucratic as possible.?
Since the room was designed to accommodate reporters and journalists from around the world, it is equipped with electrical receptacles to suit the different shapes of plugs and voltages used by appliances in all of the countries that existed when the room was built. Unfortunately, the room was built many years ago when reporters used very few electric and electronic devices and is equipped with only one receptacle of each type. These days, like everyone else, reporters require many such devices to do their jobs: laptops, cell phones, tape recorders, pagers, coffee pots, microwave ovens, blow dryers, curling?
irons, tooth brushes, etc. Naturally, many of these devices can operate on batteries, but since the meeting is likely to be long and tedious, you want to be able to plug in as many as you can.?
Before the meeting begins, you gather up all the devices that the reporters would like to use, and attempt to set them up. You notice that some of the devices use plugs for which there is no receptacle. You wonder if these devices are from countries that didn't exist when the room was built. For some receptacles, there are several devices that use the corresponding plug. For other receptacles, there are no devices that use the corresponding plug.?
In order to try to solve the problem you visit a nearby parts supply store. The store sells adapters that allow one type of plug to be used in a different type of outlet. Moreover, adapters are allowed to be plugged into other adapters. The store does not have adapters for all possible combinations of plugs and receptacles, but there is essentially an unlimited supply of the ones they do have.

Input

The input will consist of one case. The first line contains a single positive integer n (1 <= n <= 100) indicating the number of receptacles in the room. The next n lines list the receptacle types found in the room. Each receptacle type consists of a string of at most 24 alphanumeric characters. The next line contains a single positive integer m (1 <= m <= 100) indicating the number of devices you would like to plug in. Each of the next m lines lists the name of a device followed by the type of plug it uses (which is identical to the type of receptacle it requires). A device name is a string of at most 24 alphanumeric?
characters. No two devices will have exactly the same name. The plug type is separated from the device name by a space. The next line contains a single positive integer k (1 <= k <= 100) indicating the number of different varieties of adapters that are available. Each of the next k lines describes a variety of adapter, giving the type of receptacle provided by the adapter, followed by a space, followed by the type of plug.

Output

A line containing a single non-negative integer indicating the smallest number of devices that cannot be plugged in.

Sample Input

      4 
A 
B 
C 
D 
5 
laptop B 
phone C 
pager B 
clock B 
comb X 
3 
B X 
X A 
X D 
    

Sample Output

      1
    


UVa753/POJ1087_A Plug for UNIX(網絡流最大流)(小白書圖論專題)


更多文章、技術交流、商務合作、聯系博主

微信掃碼或搜索:z360901061

微信掃一掃加我為好友

QQ號聯系: 360901061

您的支持是博主寫作最大的動力,如果您喜歡我的文章,感覺我的文章對您有幫助,請用微信掃描下面二維碼支持博主2元、5元、10元、20元等您想捐的金額吧,狠狠點擊下面給點支持吧,站長非常感激您!手機微信長按不能支付解決辦法:請將微信支付二維碼保存到相冊,切換到微信,然后點擊微信右上角掃一掃功能,選擇支付二維碼完成支付。

【本文對您有幫助就好】

您的支持是博主寫作最大的動力,如果您喜歡我的文章,感覺我的文章對您有幫助,請用微信掃描上面二維碼支持博主2元、5元、10元、自定義金額等您想捐的金額吧,站長會非常 感謝您的哦!!!

發表我的評論
最新評論 總共0條評論
主站蜘蛛池模板: 人人干天天操 | 四虎影视国产精品婷婷 | 国产在线91精品入口首页 | 亚洲瑟瑟 | free性欧美极度另类超级大 | 手机看片久久国产免费不卡 | 欧美激情免费观看 | 精品一久久香蕉国产线看观看下 | 国产一级内谢a级高清毛片 国产一级片毛片 | 亚洲在线网站 | 四虎影院永久网址 | 伊人狼人视频 | 久久最新视频 | 国产精品久久久久久久久久久不卡 | 成年女人免费观看视频 | 国产中文字幕视频在线观看 | 国产成人夜色91 | 成人精品视频 成人影院 | 狠狠色丁香婷综合久久 | 国产福利在线永久视频 | 亚洲欧美成人永久第一网站 | 欧美一级午夜免费视频你懂的 | 久久青草91免费观看 | 久久精品视频7 | 欧美成人aⅴ | 国产精品欧美韩国日本久久 | 九九视频免费在线 | 欧美国产成人精品一区二区三区 | 国产精品全国探花泡良大师 | 成人高清毛片a | 国产一国产一级毛片视频在线 | 亚洲精品蜜桃久久久久久 | 九九影视理论片在线播放 | 久久综合欧美 | 日本aaaa毛片在线看 | 精品久久在线观看 | 欧美手机手机在线视频一区 | 国产成人一区二区三区视频免费 | 欧美超级碰碰 | 久久国产精品二国产精品 | 欧美操穴视频 |