【uva10779】收集者的难题

按照题意建模就行了。

#include<bits/stdc++.h>
#define naive 0
#define inf 1000000007
using namespace std;
int n,m,T,a[][],head[],tot,qwq,level[],ans,s,t;
struct Edge{int u,v,f,next;}G[];
inline void addedge(int u,int v,int f){
    G[tot].u=u;G[tot].v=v;G[tot].f=f;G[tot].next=head[u];head[u]=tot++;
    G[tot].u=v;G[tot].v=u;G[tot].f=;G[tot].next=head[v];head[v]=tot++;
}
inline bool bfs(){
    memset(level,naive,sizeof(level));queue<int>q;
    q.push(s);level[s]=;
    while(!q.empty()){
        int u=q.front();q.pop();
        if(u==t)return ;
        for(int i=head[u];~i;i=G[i].next){
            int v=G[i].v,f=G[i].f;
            if(f&&!level[v])level[v]=level[u]+,q.push(v);
        }
    }
    return naive;
}
int dfs(int u,int maxf,int t){
    if(u==t)return maxf;int rat=;
    for(int i=head[u];~i&&rat<maxf;i=G[i].next){
        int v=G[i].v,f=G[i].f;
        if(f&&level[v]==level[u]+){
            f=dfs(v,min(f,maxf-rat),t);
            rat+=f;G[i].f-=f;G[i^].f+=f;
        }
    }
    if(!rat)level[u]=inf;
    return rat;
}
inline int dinic(){
    int ans=;while(bfs())ans+=dfs(s,inf,t);
    return ans;
}
inline int read(){
    int f=,x=naive;char ch;
    do{ch=getchar();if(ch=='-')f=-;}while(ch<''||ch>'');
    do{x=x*+ch-'';ch=getchar();}while(ch>=''&&ch<='');
    return f*x;
}
int main(){
    int T=read();
    while(T--){t=;
        n=read();m=read();memset(head,-,sizeof(head));tot=naive;memset(a,,sizeof(a));
        ans=;
        for(int i=;i<=n;i++){int x=read();while(x--)a[i][read()]++;}
        for(int i=;i<=m;i++)addedge(s,i,a[][i]);
        for(int i=;i<=n;i++)for(int j=;j<=m;j++)
        if(a[i][j]>)addedge(i+m,j,a[i][j]-);
        for(int i=;i<=n;i++)for(int j=;j<=m;j++)if(!a[i][j])addedge(j,i+m,);
        for(int i=;i<=m;i++)addedge(i,t,);
        ans=dinic();printf("Case #%d: %d\n",++qwq,ans);
    }
}