BZOJ 3188: [Coci 2011]Upit Splay模板题

转啊转终于转出来了，然而我的模板跟陈竞潇的模板一模一样，还是太弱啊，第一次用指针。

#include<cstdio>
#include<cstring>
#include<algorithm>
#define for1(i,a,b) for(int i=(a);i<=(b);++i)
using namespace std;
typedef long long ll;
const int N=1E5+100;
int n,m,data[N];
struct node{
    node();
    node *ch[2],*fa;
    ll d,sum,set,add[2]; int size; short vset;
    short pl() {return this==fa->ch[1];}
    void count(); void push();
    void mark(ll,ll,short);
}*null;
node::node(){ch[0]=ch[1]=fa=null; size=vset=sum=add[0]=add[1]=0;}
void node::mark(ll val,ll dd,short t){
    if(this==null) return;
    if(!t){
        set=val;
        sum=size*set;
        d=set;
        vset=1;
        add[0]=add[1]=0;
    }else{
        add[0]+=val;
        add[1]+=dd;
        sum+=val*size;
        sum+=dd*size*(size-1)/2;
        d+=val+dd*(ch[0]->size);
    } 
}
void node::push(){
    if(this==null)return;
    if(vset){
        ch[0]->mark(set,0,0);
        ch[1]->mark(set,0,0);
        vset=0; set=0;
    }
    if(add[0]||add[1]){
        ch[0]->mark(add[0],add[1],1);
        ch[1]->mark(add[0]+add[1]*(ch[0]->size+1),add[1],1);
        add[0]=add[1]=0;
    }
}
void node::count(){
    size=ch[0]->size+ch[1]->size+1;
    sum=ch[0]->sum+ch[1]->sum+d;
}
namespace Splay{
    node *ROOT;
    node *build(int l=1,int r=n){
        if (l>r) return null;
        int mid=(l+r)>>1;
        node *ro=new node;
        ro->d=data[mid];
        ro->ch[0]=build(l,mid-1);
        ro->ch[1]=build(mid+1,r);
        ro->ch[0]->fa=ro;
        ro->ch[1]->fa=ro;
        ro->count();
        return ro;
    }
    void Build(){
        null=new node;
        *null=node();
        ROOT=build();
    }
    void rotate(node *k){
        node *r=k->fa; if (k==null||r==null) return;
        r->push(); k->push();
        int x=k->pl()^1;;
        r->ch[x^1]=k->ch[x];
        r->ch[x^1]->fa=r;
        if (r->fa!=null) r->fa->ch[r->pl()]=k;
        else ROOT=k;
        k->fa=r->fa; r->fa=k;
        k->ch[x]=r;
        r->count(); k->count();
    }
    void splay(node *r,node *tar=null){
        for (;r->fa!=tar;rotate(r))
         if (r->fa->fa!=tar)rotate(r->pl()==r->fa->pl()?r->fa:r);
        r->push();
    }
    void insert(int x,int val){
        node *r=ROOT;
        if (ROOT==null){
            ROOT=new node;
            ROOT->d=val;
            ROOT->count();
            return;
        }
        while (1)
        {
            r->push();
            int c;
            if (r->ch[0]->size+1>=x) c=0;
            else c=1,x-=r->ch[0]->size+1;
            if (r->ch[c]==null){
                r->ch[c]=new node;
                r->ch[c]->fa=r;
                r->ch[c]->d=val;
                splay(r->ch[c]);
                return;
            }else r=r->ch[c];
        }
    }
    node *kth(int k){
        node *r=ROOT;
        while (r!=null){
            r->push();
            if (r->ch[0]->size>=k) r=r->ch[0];
            else if (r->ch[0]->size+1>=k) return r;
            else k-=r->ch[0]->size+1,r=r->ch[1];
        }
        return null;
    }
    node *pack(int l,int r){
        node *ln=kth(l-1),*rn=kth(r+1);
        if ((ln==null)&&(rn==null)) return ROOT;
        else if (ln==null){
            splay(rn); return rn->ch[0];
        }else if (rn==null){
            splay(ln); return ln->ch[1];
        }else{
            splay(ln); splay(rn,ROOT);
            return rn->ch[0];
        }
    }
}
int main(){
    scanf("%d%d",&n,&m);
    for1(i,1,n)scanf("%d",&data[i]);
    Splay::Build(); int j,a,b,c;
    for1(i,1,m){
        scanf("%d",&j);
        switch(j){
            node *r;
            case 1:
                scanf("%d%d%d",&a,&b,&c);
                r=Splay::pack(a,b);
                r->mark(c,0,0);
                Splay::splay(r);
            break;
            case 2:
                scanf("%d%d%d",&a,&b,&c);
                r=Splay::pack(a,b);
                r->mark(c,c,1);
                Splay::splay(r);
            break;
            case 3:
                scanf("%d%d",&a,&b);
                Splay::insert(a,b);
            break;
            case 4:
                scanf("%d%d",&a,&b);
                r=Splay::pack(a,b);
                printf("%lld\n",r->sum);
            break;
        }
    }
    return  0;
}