hdu-3487-Play with Chain-(splay 区间翻转，切割，插入)

题意：

区间翻转，切割，插入

// File Name: ACM/HDU/3487.cpp
// Author: Zlbing
// Created Time: 2013年08月10日 星期六 21时35分28秒
 
#include<iostream>
#include<string>
#include<algorithm>
#include<cstdlib>
#include<cstdio>
#include<set>
#include<map>
#include<vector>
#include<cstring>
#include<stack>
#include<cmath>
#include<queue>
using namespace std;
#define CL(x,v); memset(x,v,sizeof(x));
#define INF 0x3f3f3f3f
#define LL long long
#define REP(i,r,n) for(int i=r;i<=n;i++)
#define RREP(i,n,r) for(int i=n;i>=r;i--)
#define L ch[x][0]
#define R ch[x][1]
#define KT (ch[ ch[rt][1] ][0])
const int MAXN = 3e5+;
struct SplayTree {
    int sz[MAXN];
    int ch[MAXN][];
    int pre[MAXN];
    int rt,top;
    inline void down(int x){
        if(flip[x]) {
            flip[ L ] ^= ;
            flip[ R ] ^= ;
            swap(L,R);
            flip[x]=;
        }
    }
    inline void up(int x){
        sz[x]=+sz[ L ] + sz[ R ];
    }
    inline void Rotate(int x,int f){
        int y=pre[x];
        down(y);
        down(x);
        ch[y][!f] = ch[x][f];
        pre[ ch[x][f] ] = y;
        pre[x] = pre[y];
        if(pre[x]) ch[ pre[y] ][ ch[pre[y]][] == y ] =x;
        ch[x][f] = y;
        pre[y] = x;
        up(y);
    }
    inline void Splay(int x,int goal){//将x旋转到goal的下面
        down(x);////防止pre[x]就是目标点，下面的循环就进不去了，x的信息就传不下去了
        while(pre[x] != goal){
            down(pre[pre[x]]); down(pre[x]);down(x);//在旋转之前需要先下传标记，因为节点的位置可能会发生改变
            if(pre[pre[x]] == goal) Rotate(x , ch[pre[x]][] == x);
            else   {
                int y=pre[x],z=pre[y];
                int f = (ch[z][]==y);
                if(ch[y][f] == x) Rotate(x,!f),Rotate(x,f);
                else Rotate(y,f),Rotate(x,f);
            }
        }
        up(x);
        if(goal==) rt=x;
    }
    inline void RTO(int k,int goal){//将第k位数旋转到goal的下面
        int x=rt;
        down(x);
        while(sz[ L ]+ != k) {
            if(k < sz[ L ] +  ) x=L;
            else {
                k-=(sz[ L ]+);
                x = R;
            }
            down(x);
        }
        Splay(x,goal);
    }
    void vist(int x){
        if(x){
            printf("结点%2d : 左儿子  %2d   右儿子  %2d   %2d  flip:%d\n",x,L,R,val[x],flip[x]);
            vist(L);
            vist(R);
        }
    }
    void Newnode(int &x,int c,int f){
        x=++top;flip[x]=;
        L = R = ;  pre[x] = f;
        sz[x]=; val[x]=c;
    }
    inline void build(int &x,int l,int r,int f){
        if(l>r) return ;
        int m=(l+r)>>;
        Newnode(x,m,f);
        build(L , l , m- , x);
        build(R , m+ , r , x);
        pre[x]=f;
        up(x);
    }  
 
    inline void init(int n){
        ch[][]=ch[][]=pre[]=sz[]=;
        rt=top=; flip[]=; val[]=;
        Newnode(rt,-,);
        Newnode(ch[rt][],-,rt);
        sz[rt]=;
        build(KT,,n,ch[rt][]);
    }
    void Del(){
         int t=rt;
         if(ch[rt][]) {
             rt=ch[rt][];
             RTO(,);
             ch[rt][]=ch[t][];
             if(ch[rt][]) pre[ch[rt][]]=rt;
         }
         else rt=ch[rt][];
         pre[rt]=;
         up(rt);
    }
    void solve1(int a,int b,int c)
    {
       RTO(a,);
       RTO(b+,rt);
       int tmp=KT;
       KT=;
       up(ch[rt][]);
       up(rt);
 
       RTO(c+,);
       RTO(c+,rt);
       KT=tmp;
       pre[tmp]=ch[rt][];
       up(ch[rt][]);
       up(rt);
    }
    void solve2(int a,int b)
    {
        RTO(a,);
        RTO(b+,rt);
        flip[KT]^=;
    }
    void print(int x)
    {
        if(x)
        {
            down(x);
            print(L);
            if(val[x]!=-)
            {
                if(flag)printf(" ");
                flag=;
                printf("%d",val[x]);
            }
            print(R);
        }
    }
    void out()
    {
        flag=;
        print(rt);
        printf("\n");
    }
    int flip[MAXN];
    int val[MAXN];
    int flag;
}spt;  
 
int main()
{
    int n,m;
    while(~scanf("%d%d",&n,&m))
    {
        if(n==-)break;
        char op[];
        int a,b,c;
        spt.init(n);
        REP(i,,m)
        {
            scanf("%s",op);
            if(op[]=='C')
            {
                scanf("%d%d%d",&a,&b,&c);
                spt.solve1(a,b,c);
            }
            else
            {
                scanf("%d%d",&a,&b);
                spt.solve2(a,b);
            }  
 
        }
        spt.out();
    }
    return ;
}