luoguP5055 【模板】可持久化文艺平衡树 可持久化非旋转treap

好题.

Code:

#include<bits/stdc++.h>
using namespace std;
#define setIO(s) freopen(s".in","r",stdin)
namespace fhqtreap{
    #define maxn 20000000
    #define ll long long
    int tot,m,tr;
    int trash[maxn];
    int ls[maxn],rs[maxn],rev[maxn],val[maxn],sz[maxn],key[maxn];
    int root[maxn];
    ll sumv[maxn];
    ll lastans;
    void ini(){
        tr=0;
        for(int i=1;i<1000000;++i) trash[++tr]=i;
        tot=1000001;
    }
    int newnode(){
        return tr?trash[tr--]:++tot;
    }
    int cpy(int p){
        int x=newnode();
        sz[x]=sz[p],ls[x]=ls[p],rs[x]=rs[p];
        rev[x]=rev[p],val[x]=val[p],key[x]=key[p],sumv[x]=sumv[p];
        return x;
    }
    void up(int x){
        sz[x]=sz[ls[x]]+sz[rs[x]]+1;
        sumv[x]=sumv[ls[x]]+sumv[rs[x]]+(long long)val[x];
    }
    int New(int v){
        int p=newnode();
        sz[p]=1,ls[p]=rs[p]=0,sumv[p]=val[p]=v,key[p]=rand(),rev[p]=0;
        return p;
    }
    void era(int x){
        sz[x]=ls[x]=rs[x]=rev[x]=val[x]=sumv[x]=key[x]=0;
        trash[++tr]=x;
    }
    void pd(int x){
        if(!x||!rev[x]) return;
        if(rev[x]){
            swap(ls[x],rs[x]);
            if(ls[x]) ls[x]=cpy(ls[x]),rev[ls[x]]^=1;
            if(rs[x]) rs[x]=cpy(rs[x]),rev[rs[x]]^=1;
            rev[x]=0;
        }
    }
    void split(int x,int k,int &l,int &r){
        if(x){
            pd(x);
            if(k<=sz[ls[x]]) {
                r=cpy(x);
                split(ls[r],k,l,ls[r]);
                up(r);
            }
            else {
                l=cpy(x);
                split(rs[l],k-sz[ls[l]]-1,rs[l],r);
                up(l);
            }
        }else l=r=0;
    }
    int mg(int l,int r){
        if(l&&r){
            if(key[l]<key[r]) {
                pd(r),ls[r]=mg(l,ls[r]),up(r);
                return r;
            }else {
                pd(l),rs[l]=mg(rs[l],r),up(l);
                return l;
            }
        }else return l+r;
    }
    void ins(int &rt,int p,int v){
        int x,y;
        split(rt,p,x,y);
        rt=mg(mg(x,New(v)),y);
    }
    void Del(int &rt,int p){
        int x,y,z;
        split(rt,p,x,y),split(x,p-1,x,z),era(z);
        rt=mg(x,y);
    }
    void Rev(int &rt,int L,int R){
        int x,y,z;
        split(rt,R,x,y),split(x,L-1,x,z),rev[z]^=1;
        rt=mg(mg(x,z),y);
    }
    void Q(int &rt,int L,int R){
        int x,y,z;
        split(rt,R,x,y),split(x,L-1,x,z), printf("%lld\n",(lastans=sumv[z]));
        rt=mg(mg(x,z),y);
    }
    int main(){
        ini();
        int n,a=0,b=0;
        scanf("%d",&n);
        for(int opt,v,i=1;i<=n;++i){
            scanf("%d%d",&v,&opt);
            root[i]=root[v];
            scanf("%d",&a),a^=lastans;
            if(opt!=2) scanf("%d",&b),b^=lastans;
            if(opt==1) ins(root[i],a,b);
            if(opt==2) Del(root[i],a);
            if(opt==3) Rev(root[i],a,b);
            if(opt==4) Q(root[i],a,b);
        }
        return 0;
    }
};
int main(){
    //setIO("input");
    fhqtreap::main();
    return 0;
}