tarjan算法模板 

 1 int n,m,hcnt,qcnt;
 2 int head[maxn],query[maxn],vis[maxn];
 3 int anc[maxn],fp[maxn],indu[maxn],ans[N];
 4 struct Node{
 5     int to,next;
 6 }node[maxn];
 7 struct Query{
 8     int to,next,index;
 9 }que[N];
10 int findp(int x){return fp[x]==x?x:fp[x]=findp(fp[x]);}
11 inline void init(){
12     mst(anc,0);mst(indu,0);mst(num,0);
13     mst(head,-1);mst(query,-1);mst(vis,0);
14     mst(ans,0);hcnt=qcnt=0;
15 }
16 inline void add(int x,int y){
17     node[hcnt].to=y;node[hcnt].next=head[x];
18     head[x]=hcnt++;
19 }
20 inline void addq(int x,int y,int i){
21     que[qcnt].to=y;que[qcnt].next=query[x];
22     que[qcnt].index=i;query[x]=qcnt++;
23 }
24 void Un(int x,int y){
25     int xx=findp(x),yy=findp(y);
26     if(xx!=yy) fp[xx]=yy;
27 }
28 void dfs(int x){
29     vis[x]=1;fp[x]=x;
30     for(int i=head[x];~i;i=node[i].next){
31         int e=node[i].to;
32         if(vis[e])continue;
33         dfs(e);
34         Un(x,e);
35         anc[findp(x)]=x;
36     }
37     for(int i=query[x];~i;i=que[i].next){
38         int e=que[i].to;
39         if(vis[e]){
40             ans[que[i].index]=anc[findp(e)];
41         }
42     }
43 }

 

posted @ 2016-05-30 20:31  Kurokey  阅读(184)  评论(0)    收藏  举报