UVA 753 - A Plug for UNIX
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最大流的模板题 前n个 连接汇点 中间m个连接源点 最后k个为中间路径
#include<cstdio>
#include<cstring>#include<queue>
#include<map>
#include<string>
using namespace std;
#define M 2020
#define INF 1<<27
int n,m,s,t,k,l;
int head[M],end[M];
int flow[M][M],cap[M][M],a[M],p[M];
int bfs()
{
queue<int>q;
memset(flow,0,sizeof(flow));
int f = 0;
while(1)
{
memset(a,0,sizeof(a));
a[s] = INF;
q.push(s);
while(!q.empty())
{
int u = q.front();
q.pop();
for(int v = 1; v <= l; v++)
if(!a[v]&&cap[u][v]>flow[u][v])
{
p[v] = u;
q.push(v);
a[v] = min(a[u],cap[u][v]-flow[u][v]);
}
}
if(!a[t]) break;
for(int u = t; u != 0; u = p[u])
{
flow[p[u]][u] += a[t];
flow[u][p[u]] -= a[t];
}
f += a[t];
}
return f;
}
int main()
{
int te;
char s1[403],s2[430],s3[100],s4[100];
scanf("%d",&te);
while(te--)
{
map<string,int> str;
str.clear();
scanf("%d",&n);
getchar();
s = 0;
t = 1;
l = 2;
for(int i = 1; i <= n; i++)
{
gets(s1);
if(!str[s1]) str[s1] = l++;
cap[str[s1]][t]++;
}
scanf("%d",&m);
getchar();
for(int i = 1; i <= m; i++)
{
scanf("%s %s",s2,s3);
if(!str[s3]) str[s3] = l++;
cap[s][str[s3]]++;
getchar();
}
scanf("%d",&k);
int u,v;
for(int i = 1; i <= k; i++)
{
scanf("%s %s",s2,s4);
if(!str[s2]) str[s2] = l++;
u = str[s2];
if(!str[s4]) str[s4] = l++;
v = str[s4];
cap[u][v] = INF;
}
printf("%d\n",m-bfs());
if(te) printf("\n");
memset(cap,0,sizeof(cap));
memset(p,0,sizeof(p));
}
return 0;
}
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