邻接表模板

struct Node
{
    int from,to,next;
}edge[MAXM];
int tol;
int head[MAXN];
void init()
{
    tol=0;
    memset(head,-1,sizeof(head));
}
void addedge(int u,int v)
{
    edge[tol].from=u;
    edge[tol].to=v;
    edge[tol].next=head[u];
    head[u]=tol++;
}
for(int i=head[u];i!=-1;i=edge[i].next)
{
}