poj1149最大流

 #include <cstdio>
#include <cstring>
#include <algorithm>
#include <climits>
#include <string>
#include <iostream>
#include <map>
#include <cstdlib>
#include <list>
#include <set>
#include <queue>
#include <stack>
using namespace std;
const int INF=0xfffffff;
int n,m;
const int maxn=1111;
int level[maxn];
int Map[maxn][maxn];
int last[maxn];
int s,e;
int pig[maxn];
bool bfs()
{
    memset(level,0,sizeof(level));
    queue<int> q;
    q.push(s);level[s]=1;
    while(!q.empty()){
        int cur=q.front();q.pop();
        for(int i=0;i<=n+1;i++){
            if(!level[i]&&Map[cur][i]){
                level[i]=level[cur]+1;
                q.push(i);
            }
        }
    }
    return level[e];
}
int Min(int a,int b)
{
    return a>b?b:a;
}
int dfs(int x,int val)
{
    int tem=val;
    if(x==e) return val;
    for(int i=0;i<=n+1;i++){
        if(level[i]==level[x]+1&&Map[x][i]&&tem){
            int t=dfs(i,Min(val,Map[x][i]));
            Map[x][i]-=t;Map[i][x]+=t;
           // cout<<tem<<endl;system("pause");
        //   if(t==0) return 0;
           tem-=t;
        }
    }
    return val-tem;
}
int solve()
{
    int ans=0;int t;
    while(bfs()){
        while(t=dfs(s,INF)) ans+=t;
    }
    return ans;
}
int main()
{
    while(scanf("%d%d",&m,&n)!=EOF){
    s=0;e=n+1;
    int t;int k;
    memset(last,0,sizeof(last));
    memset(Map,0,sizeof(Map));
    for(int i=1;i<=m;i++)
        scanf("%d",&pig[i]);
    for(int i=1;i<=n;i++){
        scanf("%d",&t);
        for(int j=0;j<t;j++){
            scanf("%d",&k);
            if(last[k]==0){
                Map[s][i]+=pig[k];
            }
            else Map[last[k]][i]=INF;
            last[k]=i;
        }
        scanf("%d",&Map[i][e]);
    }
    printf("%d\n",solve());
    }
    return 0;
}

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poj1149最大流

原文：http://www.cnblogs.com/yigexigua/p/3873010.html