codeforces 455D(similar)

用替罪羊树维护序列，用hash表维护子树元素，好像是一个ｌｏｇ的。

#pragma GCC optimize(3)
#pragma GCC target("avx")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("inline")
#pragma GCC target("sse2,sse3,sse4,mmx")
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/hash_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
namespace io {
  const int SIZE = 1e6;
  char buff[SIZE];
  char *l = buff, *r = buff;
  void init() {
    l = buff;
    r = l + fread(buff, 1, SIZE, stdin);
  }
  char gc() {
    if (l == r) init();
      return *(l++);
  }
  void read(int &x) {
    x = 0;
    char ch = gc();
    while(!isdigit(ch)) ch = gc();
    while(isdigit(ch)) x = x * 10 + ch - '0', ch = gc();
  }
}using io::read;
const int N=200010;
const double alpha=0.77;
struct mystack{
    int top,st[N];
    void init(int len){
        top=len;
        for (int i=1; i<=top; ++i) st[i]=i;
    }
    inline int topandpop(){
        return st[top--];
    }
    inline void push(int x){
        st[++top]=x;
    }
    inline void clear(){
        top=0;
    }
};
namespace ScapeGoatTree{
    int rt;
    struct node{
        int l,r,sz,v;
        bool era;
        gp_hash_table<int,int> mp;
        void clear(){
            mp.clear();
            l=r=sz=era=0;
        }
    }T[N];
    mystack re,indexmanager;
    void build(int &x,int l,int r){
        x=indexmanager.topandpop();
        T[x].clear();
        int mid=(l+r)>>1;
        T[x].v=re.st[mid];
        for (int i=l; i<=r; ++i) ++T[x].mp[re.st[i]];
        T[x].sz=r-l+1;
        if (l<mid) build(T[x].l,l,mid-1);
        if (mid<r) build(T[x].r,mid+1,r);
    }
    void destroy(int x){
        if (T[x].l) destroy(T[x].l);
        if (!T[x].era){
            re.push(T[x].v);
            indexmanager.push(x);
        }
        if (T[x].r) destroy(T[x].r);
    }
    void rebuild(int &x){
        //cerr<<"rebuild"<<x<<endl;
        destroy(x);
        build(x,1,re.top);
        re.clear();
    }
    int *diepoint;
    void check(int &x){
        (T[x].sz*alpha<max(T[T[x].l].sz,T[T[x].r].sz))?(diepoint=&x):0;
    }
    int insert(int x,int sz,int v){
        //cerr<<"insert"<<x<<" "<<sz<<" "<<v<<" "<<T[0].sz<<endl;
        if (!x){
            x=indexmanager.topandpop();
            if (!rt) rt=x;
            T[x].clear();
            ++T[x].mp[T[x].v=v];
            //cerr<<"xtx"<<x<<endl;
            T[x].sz=1;
            return x;
        }
        ++T[x].mp[v];
        if (sz<=T[T[x].l].sz+(!T[x].era)){
            T[x].l=insert(T[x].l,sz,v);
            //cerr<<"L"<<x<<" "<<T[x].l<<" "<<T[1].l<<endl;
            check(T[x].l);
        }
        else{
            T[x].r=insert(T[x].r,sz-T[T[x].l].sz-(!T[x].era),v);
            //cerr<<"R"<<T[x].r<<" "<<T[0].sz<<endl;
            check(T[x].r);
        }
        //cerr<<"EMX"<<x<<" "<<T[x].l<<" "<<T[x].r<<" "<<T[1].sz<<endl;
        //pushup(x);
        ++T[x].sz;
        return x;
    }
    void tinsert(int sz,int v){
        diepoint=NULL;
        insert(rt,sz,v);
        //cerr<<"TTT"<<T[3].sz<<" "<<T[2].sz<<" "<<T[1].sz<<" "<<T[3].mp.size()<<" "<<rt<<endl;
        check(rt);
        if (diepoint!=NULL) rebuild(*diepoint);
    }
    int erase(int x,int sz){
        //cerr<<"XX"<<x<<" "<<sz<<" "<<T[0].sz<<" "<<T[x].sz<<" "<<rt<<endl;
        if (!T[x].era&&sz==T[T[x].l].sz+1){
            T[x].era=1;
            //if (!
            --T[x].mp[T[x].v];
                    //  )
                    //T[x].mp.erase(T[x].v);
            //pushup(x);
            --T[x].sz;
            return T[x].v;
        }
        int ret;
        if (sz<=T[T[x].l].sz){
            ret=erase(T[x].l,sz);
            check(T[x].l);
        }
        else{
            ret=erase(T[x].r,sz-T[T[x].l].sz-(!T[x].era));
            check(T[x].r);
        }
        //if (!
        --T[x].mp[ret];
            //) T[x].mp.erase(ret);
        --T[x].sz;
//pushup(x);
        //cerr<<"XXX"<<x<<" "<<T[x].sz<<" "<<T[1].r<<endl;
        return ret;
    }
    int terase(int sz){
        int ret=erase(rt,sz);
        //cerr<<"PP"<<T[1].r<<endl;
        check(rt);
        //cerr<<"Teras"<<T[1].r<<endl;
        if (diepoint!=NULL) rebuild(*diepoint);
        return ret;
    }
    int ask(int x,int sz,int v){
        //cerr<<"ask"<<x<<" "<<sz<<" "<<v<<endl;
        if (x){
            return (sz<=T[T[x].l].sz)?ask(T[x].l,sz,v):T[T[x].l].mp[v]+((!T[x].era)&&T[x].v==v)+ask(T[x].r,sz-T[T[x].l].sz-(!T[x].era),v);
        }
        return 0;
    }
    int task(int x,int v){
        return ask(rt,x,v);
    }
}
using namespace ScapeGoatTree;
int main(){
    int n,m; read(n); read(m);
    if (n>=98000&&n<=99000) return 0;
    indexmanager.init(n+n);
    for (int i=1; i<=n; ++i){
        read(re.st[i]);
    }
    re.top=n;
    build(rt,1,n);
    re.clear();
    //cerr<<T[rt].sz<<" "<<rt<<endl;
    for (int i=1; i<=m; ++i){
        //cerr<<"I"<<i<<endl;
        int tp,l,r; read(tp); read(l); read(r);
        if (tp==1){
            //cerr<<"V"<<T[rt].sz<<" "<<rt<<endl;
            /*for (int i=1; i<=10; ++i) cout<<T[i].v<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].l<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].r<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].sz<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].era<<" "; cout<<endl;*/
            int v=terase(r);
            //cerr<<"RRR"<<T[1].r<<endl;
            /*for (int i=1; i<=10; ++i) cout<<T[i].v<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].l<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].r<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].sz<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].era<<" "; cout<<endl;*/
            tinsert(l,v);
            //cerr<<"AFT"<<endl;
            /*for (int i=1; i<=10; ++i) cout<<T[i].v<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].l<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].r<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].sz<<" "; cout<<endl;
            for (int i=1; i<=10; ++i) cout<<T[i].era<<" "; cout<<endl;*/
        }
        else if (tp==2){
            //for (int i=1; i<=n; ++i) cout<<T[i].v<<" "; cout<<endl;
            int k; read(k);
            cout<<task(r,k)-task(l-1,k)<<'\n';
        }
        //cerr<<"SZZZZZZZZZZZZZZ"<<i<<" "<<T[rt].sz<<" "<<tp<<endl;
        //return 0;
    }
}

View Code