HDU 3002

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstring>
 4 using namespace std;
 5 
 6 const int MAXN=150;
 7 const int inf=10000000;
 8 int vis[MAXN],combine[MAXN],wan[MAXN];
 9 int map[MAXN][MAXN];
10 int n,m,t;
11 int mincut,S,T;
12 
13 void seacut(){
14     int Max; int p;
15     S=T=-1;
16     memset(vis,0,sizeof(vis));
17     memset(wan,0,sizeof(wan));
18     for(int i=0;i<n;i++){
19         Max=-inf;
20         for(int j=0;j<n;j++){
21             if(!combine[j]&&!vis[j]&&wan[j]>Max){
22                 Max=wan[j]; p=j;
23             }
24         }
25     //    cout<<p<<endl;
26         if(p==T) return;
27         S=T;T=p;
28         vis[T]=1;
29         for(int j=0;j<n;j++){
30             if(!combine[j]&&!vis[j]){
31                 wan[j]+=map[T][j];
32             }
33         }
34     }
35 }
36 
37 void storewanger(){
38     mincut=inf;
39     memset(combine,0,sizeof(combine));
40     for(int i=0;i<n-1;i++){
41         seacut();
42         if(wan[T]<mincut) mincut=wan[T];
43         if(mincut==0) return;
44         combine[T]=1;
45         for(int j=0;j<n;j++){
46             if(!combine[j]){
47                 map[S][j]+=map[T][j];
48                 map[j][S]+=map[j][T];
49             }
50         }
51     }
52 }
53 
54 int main(){
55     int u,v,w;
56     while(scanf("%d%d",&n,&m)!=EOF){
57         memset(map,0,sizeof(map));
58         for(int i=0;i<m;i++){
59             scanf("%d%d%d",&u,&v,&w);
60             map[u][v]+=w;
61             map[v][u]+=w;
62         //    cout<<"YES"<<endl;
63         }
64     //    cout<<"YES"<<endl;
65         storewanger();
66         printf("%d\n",mincut);
67     }
68     return 0;
69 }