Link-Cut Tree指针模板

模板:

  以下为弹飞绵羊代码:

  1 #define Troy
  2 
  3 #include "bits/stdc++.h"
  4 
  5 using namespace std;
  6 
  7 const int N=2e5+5;
  8 
  9 inline int read(){
 10     int s=0,k=1;char ch=getchar();
 11     while(ch<'0'|ch>'9')    ch=='-'?k=-1:0,ch=getchar();
 12     while(ch>47&ch<='9')    s=s*10+(ch^48),ch=getchar();
 13     return s*k;
 14 }
 15 
 16 #define size(t) (t?t->size:0)
 17 #define rev(t)  (t?t->rev^=1:0)
 18 
 19 struct Node{
 20     int size,rev;
 21     Node *fa,*son[2];
 22     Node(){fa=son[0]=son[1]=NULL;size=1,rev=0;}
 23     inline void update(){
 24         size=1+size(son[0])+size(son[1]);
 25     }
 26     inline void pushdown(){
 27         if(!rev)    return;
 28         rev=0,swap(son[0],son[1]);
 29         rev(son[0]),rev(son[1]);    
 30     }
 31 }*pool[N],*tmp[N],tree[N];int top;
 32 
 33 inline void init_pool(){for(;top<N;++top)   pool[top]=tree+top;}
 34 
 35 inline void newNode(Node *&p,Node *f){p=pool[--top];*p=Node();p->fa=f;}
 36 inline void freeNode(Node *&p){pool[top++]=p,p=NULL;}
 37 
 38 int to[N],n;
 39 class LinkCutTree{
 40 public:
 41     Node *node[N];
 42     inline void init(int n){for(register int i=1;i<=n;++i)newNode(node[i],NULL);}
 43     
 44     #define son(p)  (p->fa->son[1]==p)
 45     #define is_root(p)  ((!p->fa)||(p->fa->son[0]!=p&&p->fa->son[1]!=p))
 46 
 47     inline void rotate(Node *p){
 48         int a=son(p)^1;Node *f=p->fa;
 49         f->son[a^1]=p->son[a];
 50         if(p->son[a])   p->son[a]->fa=f;
 51         p->fa=f->fa;
 52         if(!is_root(f))   p->fa->son[son(f)]=p;
 53         f->fa=p,p->son[a]=f,f->update(),p->update();
 54     }
 55 
 56     inline void splay(Node *p){
 57         register int pos=0;
 58         for(Node *t=p;;t=t->fa){
 59             tmp[++pos]=t;
 60             if(is_root(t)) break;
 61         }
 62         for(;pos;--pos) tmp[pos]->pushdown();
 63         for(;!is_root(p);rotate(p))
 64             if(!is_root(p->fa)) rotate(son(p)==son(p->fa)?p->fa:p);
 65     }
 66 
 67     inline void access(Node *p){
 68         for(Node *pre=NULL;p;pre=p,p=p->fa)
 69             splay(p),p->son[1]=pre,p->update();
 70     }
 71 
 72     inline void make_root(Node *p){
 73         access(p),splay(p),rev(p);
 74     }
 75 
 76     inline void cut(Node *x,Node *y){
 77         make_root(x),access(y),splay(y);
 78         x->fa=y->son[0]=NULL;y->update();
 79     }
 80 
 81     inline void link(Node *x,Node *y){make_root(x);x->fa=y;}
 82     inline void link(int x,int y){node[x]->fa=node[y];}
 83 
 84     inline void op1(int x){
 85         make_root(node[n+1]),access(node[x]),splay(node[x]);
 86         printf("%d\n",node[x]->size-1);
 87     }
 88 
 89     inline void op2(int x,int y){
 90         cut(node[x],node[min(n+1,x+to[x])]);
 91         link(node[x],node[min(n+1,y+x)]);to[x]=y;
 92     }
 93 }lct;
 94 
 95 int main(){
 96     n=read();
 97     init_pool();
 98     lct.init(n+1);
 99     register int i;
100     for(i=1;i<=n;++i){
101         to[i]=read();
102         lct.link(i,min(i+to[i],n+1));
103     }
104     int q=read(),x,y;
105     while(q--){
106         if(read()==1)
107             lct.op1(read()+1);
108         else{
109             x=read(),y=read();
110             lct.op2(x+1,y);
111         }
112     }return 0;
113 }

 

posted @ 2017-12-15 12:59  Troywar  阅读(346)  评论(0编辑  收藏  举报