SplayTree

  1 #include <iostream>
  2 #include <cstdio>
  3 #include <cstring>
  4 #include <algorithm>
  5 #define KT ch[ch[root][1]][0]
  6 #define LC ch[x][0]
  7 #define RC ch[x][1]
  8 #define N 310001
  9 using namespace std;
 10 
 11 struct SplayTree{
 12     int root;
 13     int fa[N];
 14     int ch[N][2];
 15     int sz[N];
 16     int top1;
 17     int top2;
 18     int ss[N];
 19     int que[N];
 20 
 21 
 22     void rotate(int x,bool f){
 23         int y=fa[x];
 24         int z=fa[y];
 25         pushdown(y);
 26         pushdown(x);
 27         ch[y][!f]=ch[x][f];
 28         fa[ch[x][f]]=y;
 29         fa[x]=z;
 30         if (z) {
 31             ch[z][ch[z][1]==y] = x;
 32         }
 33         ch[x][f] = y;
 34         fa[y]=x;
 35         pushup(y);
 36     }
 37     void splay(int x, int g) {
 38         int y = fa[x];
 39         pushdown(x);
 40         while(y!=g){
 41             int z= fa[y];
 42             bool f = (ch[y][0]==x);
 43             if(z != g && f == (ch[z][0]==y)){
 44                 rotate(y,f);
 45             }
 46             rotate(x,f);
 47             y=fa[x];
 48         }
 49         pushup(x);
 50         if(g==0) root = x;
 51     }
 52     void rotateTo(int k,int g) {
 53         int x=root;
 54         pushdown(x);
 55         while(sz[LC] != k){
 56             if(k<sz[LC]){
 57                 x=LC;
 58             }else{
 59                 k -= sz[LC] + 1;
 60                 x = RC;
 61             }
 62             pushdown(x);
 63         }
 64         splay(x,g);
 65     }
 66     void build(int l,int r,int f){
 67         if(l>r){
 68             return ;
 69         }
 70         int x = (l + r) >> 1;
 71         LC = (x - 1 >= l)? (x - 1 + l)>> 1 :0;
 72         RC = (r >= x + 1)? (x + 1 + r)>> 1 :0;
 73         fa[x] = f;
 74         build(l,x - 1,x);
 75         build(x + 1,r,x);
 76         pushup(x);
 77     }
 78     void erase(int x){
 79         if(x==0)
 80             return;
 81         int father= fa[x];
 82         int head = 0, tail=0;
 83         for(que[tail++] =x ; head < tail; head++){
 84             ss[top2++] = que[head];
 85             if(ch[que[head]][0]){
 86                 que[tail++]=ch[que[head]][0];
 87             }
 88             if(ch[que[head]][1]){
 89                 que[tail++] = ch[que[head]][1];
 90             }
 91         }
 92         ch[father][ch[father][1]==x]=0;
 93         pushup(father);
 94     }
 95     void makeTree(int &x, int l, int r, int f){
 96         if(l > r){
 97             return;
 98         }
 99         int m=(l+r)>>1;
100         newNode(x, m);
101         makeTree(LC,l,m-1,x);
102         makeTree(RC,m+1,r,x);
103         fa[x]=f;
104         pushup(x);
105     }
106     void treaval(int x){
107         if (x) {
108             pushdown(x);
109             treaval(LC);
110             //printf("@%d",val[x]);
111             ans[cnt++]=val[x];
112             treaval(RC);
113         }
114     }
115 
116     void newNode(int &x,int c){
117         if(top2){
118             x = ss[--top2];
119         } else {
120             x = ++top1;
121         }
122         LC = RC = fa[x] =0;
123         sz[x] = 1;
124     }
125     void pushdown(int x){
126 
127     }
128     void pushup(int x){
129         sz[x]=1+sz[LC]+sz[RC];
130     }
131 
132     void debug(){
133         treaval(root);
134         cout<<endl;
135     }
136     void cutTo(int l,int r,int c){
137         rotateTo(l-1,0);
138         rotateTo(r+1,root);
139         int tmp=KT;
140         KT=0;
141         pushup(ch[root][1]);
142         pushup(root);
143 
144         rotateTo(c,0);
145         rotateTo(c+1,root);
146         fa[tmp]=ch[root][1];
147         KT=tmp;
148         pushup(ch[root][1]);
149         pushup(root);
150     }
151 
152     void init(int n){
153 
154         top1=top2=root=0;
155         newNode(root,0);
156         newNode(ch[root][1],0);
157         fa[ch[root][1]]=root;
158         //for(int i=1;i<=n;i++)scanf("%d",&num[i]);
159         makeTree(KT,1,n,ch[root][1]);
160         pushup(ch[root][1]);
161         pushup(root);
162     }
163     void solve(int n,int m){
164 
165     }
166 
167 }spt;