BZOJ 1391 网络流

vis[0]没有清零查一年…

//By SiriusRen#include <cstdio>#include <cstring>#include <algorithm>using namespace std;#define N 55555#define M 3666666int n,m,xx,yy,first[N],vis[N],nxt[M],v[M],w[M],tot,all,jy,ed,ans,cur[N],q[M],head,tail;void Add(int x,int y,int z){}void add(int x,int y,int z){    w[tot]=z,v[tot]=y,nxt[tot]=first[x],first[x]=tot++;    w[tot]=0,v[tot]=x,nxt[tot]=first[y],first[y]=tot++;}bool tell(){    for(int i=1;i<=ed;i++)vis[i]=-1;    head=tail=0;    while(head<=tail){        int t=q[head++];        for(int i=first[t];~i;i=nxt[i])            if(!~vis[v[i]]&&w[i])                vis[v[i]]=vis[t]+1,q[++tail]=v[i];    }    return ~vis[ed];}int zeng(int x,int y){    if(x==ed)return y;    int r=0;    for(int i=cur[x];~i&&y>r;i=nxt[i])        if(vis[v[i]]==vis[x]+1&&w[i]){            int t=zeng(v[i],min(w[i],y-r));            w[i]-=t,w[i^1]+=t,r+=t;            if(w[i]>0)cur[x]=i;        }    if(!r)vis[x]=-1;    return r;}inline int read(){    int x=0;char p=getchar();    while(p<'0'||p>'9')p=getchar();    while(p>='0'&&p<='9')x=x*10+p-'0',p=getchar();    return x;}int main(){    memset(first,-1,sizeof(first));    scanf("%d%d",&n,&m),ed=n+m+1;    for(int i=1;i<=n;i++){        xx=read(),jy=read();        all+=xx,add(0,i,xx);        while(jy--)xx=read(),yy=read(),add(i,xx+n,yy);    }    for(int i=1;i<=m;i++)xx=read(),add(i+n,ed,xx);    while(tell()){        for(int i=0;i<=ed;i++)cur[i]=first[i];        while(jy=zeng(0,0x3fffffff))ans+=jy;    }    printf("%d\n",all-ans);}