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<pre name="code" class="cpp">#include<iostream>
#include<sstream>
#include<string>
#include<vector>
#include<list>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<algorithm>
#include<numeric>
#include<cmath>
#pragma warning(disable:4996)
using std::cin;
using std::cout;
using std::endl;
using std::stringstream;
using std::string;
using std::vector;
using std::list;
using std::pair;
using std::set;
using std::multiset;
using std::map;
using std::multimap;
using std::stack;
using std::queue;
using std::priority_queue;
const int infinity =1000000000;
class Network
{
private:
int vexnum, edgenum, maxflow, source, destination;
vector<vector<int>>flow, capacity;
int receptacle, device, adapter;//表示插座数，电器数，转换器种类
vector<string>table_receptacle;
vector<string>table_device;
vector<pair<string, string>>table_adapter;
public:
void addEdge()
{
int from, to, c; cin >> from >> to >> c;
capacity[from - 1][to - 1] += c;
}
void addEdge(const int &from,const int &to,const int &c)
{
capacity[from][to] = c;
}
Network()
{
source = 0;//源点设置成0
//接受插座
cin >> receptacle; table_receptacle.resize(1);
for (int i = 0; i < receptacle; i++)
{
string type; cin >> type;//插座的类型
table_receptacle.push_back(type);
}
//接受电器
cin >> device; table_device.resize(1);
for (int i = 0; i < device; i++)
{
string name, type; cin >> name >> type;
table_device.push_back(type);
}
//接受适配器
cin >> adapter; table_adapter.resize(1);
for (int i = 0; i < adapter; i++)
{
string type1, type2; cin >> type1 >> type2;
table_adapter.push_back({ type1,type2 });
}
//初始化源点，汇点，邻接表，顶点数
source = 0, destination = device + receptacle + adapter + 1, vexnum = 1 + destination;
flow.resize(vexnum, (vector<int>)vexnum), capacity.resize(vexnum, (vector<int>)vexnum);
//连边
for (int i = 1; i <= device; i++)
{
addEdge(source, i, 1);
for (int j = 1; j <= receptacle; j++)
{
if (table_device[i] == table_receptacle[j])
{
addEdge(i, device + j, 1);
}
}
for (int j = 1; j <= adapter; j++)
{
if (table_device[i] == table_adapter[j].first)
{
addEdge(i, device + receptacle + j, infinity);
}
}
}
for (int i = 1; i <= receptacle; i++)
{
addEdge(device + i, destination, 1);
for (int j = 1; j <= adapter; j++)
{
if (table_receptacle[i] == table_adapter[j].second)
{
addEdge(device + receptacle + j, device + i, 1);
}
}
}
for (int i = 1; i <= adapter; i++)
{
for (int j = 1; j <= adapter; j++)
{
if (i == j)
{
continue;
}
if (table_adapter[i].first == table_adapter[j].second)
{
addEdge(device + receptacle + j, device + receptacle + i, infinity);
}
}
}
}
void getMaxFlow_EK()
{
maxflow = 0;
queue<int> Q;
while (!Q.empty())
{
Q.pop();
}
vector<int>path(vexnum);
while (true)
{
vector<int>remnant(vexnum);//残余流量得变0,一开始所有点都没流入对吧
remnant[source] = infinity; //源点嘛,剩余流量无限是必须的...
Q.push(source); //从源点开始进行BFS找增广路
int from, to;
while (!Q.empty())
{
from = Q.front();Q.pop();
for (to = 0; to < vexnum; to++)//遍历所有点,找可行边
{
if (!remnant[to] && capacity[from][to]>flow[from][to])
{ //该点剩余流量为0 且 容量大于流量,也就是找到了新的结点
path[to] = from; //找到新结点,父节点得记录一下吧
Q.push(to);
remnant[to] = std::min(remnant[from], capacity[from][to] - flow[from][to]); //如果u的剩余流量能填满uv就填满,不能的话就把u这点的流量全部流向uv
}
}
}
if (remnant[destination] == 0) //如果当前已经是最大流,汇点没有残余流量
{
break;
}
for (from = destination; from != source; from = path[from])
{ //如果还能增广,那么回溯,从汇点往回更新每条走过的边的流量
flow[path[from]][from] += remnant[destination]; //更新正向流量 （注意这里更新的是流量，而不是容量）
flow[from][path[from]] -= remnant[destination]; //更新反向流量
}
maxflow += remnant[destination];
}
}
void print()
{
cout << device - maxflow << endl ;
}
};
int main()
{
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
int n; cin >> n;
while (n--)
{
Network network;
network.getMaxFlow_EK();
network.print();
if (n)
{
cout << endl;
}
}
return 0;
}标签：
原文地址：http://blog.csdn.net/cxy7tv/article/details/51363801
