最大流Dinic模板

 1 int bfs()
 2 {
 3     queue<int>q;
 4     memset(d,0,sizeof(d));
 5     d[1]=1;
 6     q.push(1);
 7     while (!q.empty())
 8     {
 9         int u=q.front();
10         q.pop();
11         for (int i=head[u];i!=-1;i=eage[i].next)
12         {
13             int v=eage[i].v;
14             if (!d[v]&&eage[i].cap>0)
15             {
16                 d[v]=d[u]+1;
17                 q.push(v);
18             }
19         }
20     }
21     return d[n];
22 }
23
24 int dfs(int u,int w)
25 {
26     if (u==n||w==0) return w;
27     int ans=0;
28     for (int i=head[u];i!=-1;i=eage[i].next)
29     {
30         int v=eage[i].v;
31         if (d[u]==d[v]-1&&eage[i].cap>0)
32         {
33             int temp=dfs(v,min(w,eage[i].cap));
34             eage[i].cap-=temp;
35             eage[i^1].cap+=temp;
36             w-=temp;
37             ans+=temp;
38         }
39     }
40     return ans;
41 }
42
43 int dinic()
44 {
45     int ans=0;
46     while (bfs()) ans+=dfs(1,10000000);
47     return ans;
48 }