hdu3487 伸展树（区间搬移 区间旋转）

    对于区间旋转使用lazy思想就能解决。然后对于区间搬移，先把a-1结点做根，b+1作为它的右孩子，这样ch[ch[root][1]][0]就是区间[a,b]，现将他取出。

然后在将当前的树伸展，把c结点转到根，c+1作为它的右孩子，这样c+1结点的左孩子就是空的，直接将上次取出的作为c+1结点的做孩子即可。

 

#include<queue>
#include<stack>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#define INF 99999999
#define ll __int64
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define key_value ch[ch[root][1]][0]
using namespace std;
const int MAXN = 3*100010;
int pre[MAXN],ch[MAXN][2],siz[MAXN],key[MAXN],rev[MAXN],root,tot1;
int n;
void Treavel(int x)
{
    if(x)
    {
        Treavel(ch[x][0]);
        printf("结点%2d:左儿子 %2d 右儿子 %2d 父结点 %2d size=%2d key=%2d\n",x,ch[x][0],ch[x][1],pre[x],siz[x],key[x]);
        Treavel(ch[x][1]);
    }
}
void debug()
{
    printf("root:%d\n",root);
    Treavel(root);
}
void Newnode(int &rt,int pa,int k)
{
    rt = ++tot1;
    pre[rt] = pa;
    siz[rt] = 1;
    rev[rt] = 0;
    key[rt] = k;
    ch[rt][0] = ch[rt][1] = 0;
}
void pushup(int rt)
{
    siz[rt] = siz[ch[rt][0]] + siz[ch[rt][1]] + 1;
}
void pushdown(int rt)
{
    if(rev[rt]){
        rev[ch[rt][0]] ^= 1;
        rev[ch[rt][1]] ^= 1;
        swap(ch[rt][0],ch[rt][1]);
        rev[rt] = 0;
    }
}
void build(int &rt,int l,int r,int pa)
{
    if(l > r)
        return ;
    int m = (l+r)/2;
    Newnode(rt,pa,m);
    build(ch[rt][0],l,m-1,rt);
    build(ch[rt][1],m+1,r,rt);
    pushup(rt);
}
void Init()
{
    tot1 = root = 0;
    pre[root] = siz[root] = key[root] = rev[root] = 0;
    ch[root][0] = ch[root][1] = 0;
    Newnode(root,0,-1);
    Newnode(ch[root][1],root,-1);
    build(key_value,1,n,ch[root][1]);
    pushup(ch[root][1]);
    pushup(root);
}
void Rotate(int rt,int kind)
{
    int y = pre[rt];
    pushdown(y);
    pushdown(rt);
    ch[y][!kind] = ch[rt][kind];
    pre[ch[rt][kind]] = y;
    if(pre[y]){
        ch[pre[y]][ch[pre[y]][1]==y] = rt;
    }
    pre[rt] = pre[y];
    ch[rt][kind] = y;
    pre[y] = rt;
    pushup(y);
}
void splay(int rt,int goal)
{
    pushdown(rt);
    while(pre[rt] != goal)
    {
        if(pre[pre[rt]] == goal){
            pushdown(pre[rt]);
            pushdown(rt);
            Rotate(rt,ch[pre[rt]][0]==rt);
        }
        else {
            pushdown(pre[pre[rt]]);
            pushdown(pre[rt]);
            pushdown(rt);
            int y = pre[rt];
            int kind = ch[pre[y]][0]==y;
            if(ch[y][kind] == rt){
                Rotate(rt,!kind);
                Rotate(rt,kind);
            }
            else {
                Rotate(y,kind);
                Rotate(rt,kind);
            }
        }
    }
    if(goal == 0)
        root = rt;
    pushup(rt);
}
int Get_kth(int rt,int k)
{
    pushdown(rt);
    int t = siz[ch[rt][0]] + 1;
    if(t == k)
        return rt;
    else if(t > k){
        return Get_kth(ch[rt][0],k);
    }
    else {
        return Get_kth(ch[rt][1],k-t);
    }
    pushup(rt);
}
void cut(int x,int y,int z)
{
    splay(Get_kth(root,x),0);
    splay(Get_kth(root,y+2),root);
    //debug();
    int tmp = key_value;
    key_value = 0;
    pushup(ch[root][1]);
    pushup(root);
    splay(Get_kth(root,z+1),0);
    splay(Get_kth(root,z+2),root);
    //debug();
    key_value = tmp;
    pre[tmp] = ch[root][1];
    pushup(ch[root][1]);
    pushup(root);
    //debug();
}
int flag;
void display(int rt)
{
    if(rt == 0)
        return ;
    pushdown(rt);
    display(ch[rt][0]);
    if(!flag && rt !=1 && rt != 2){
        flag = 1;
        printf("%d",key[rt]);
    }
    else if(rt !=1 && rt != 2){
        printf(" %d",key[rt]);
    }
    display(ch[rt][1]);
}
int main()
{
    int i,j,m;
    while(~scanf("%d%d",&n,&m),n!=-1&&m!=-1)
    {
        Init();
        char work[10];
        while(m--)
        {
            scanf("%s",work);
            if(work[0] == 'F'){
                int x,y;
                scanf("%d%d",&x,&y);
                splay(Get_kth(root,x),0);
                splay(Get_kth(root,y+2),root);
                rev[key_value] ^= 1;
                //debug();
            }
            else {
                int x,y,z;
                scanf("%d%d%d",&x,&y,&z);
                cut(x,y,z);
            }
        }
        //debug();
        flag = 0;
        display(root);
        cout<<endl;
    }
}