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204 | // 没啥活好整了，给大家咬个打火机吧
#include <bits/stdc++.h>
using namespace std;
const double alpha = 0.2928;
typedef struct NODE{
int value;
int size;
NODE *lchild,*rchild;
NODE(int x){
this->value = x;
this->size = 1;
this->lchild = this->rchild = nullptr;
}
NODE(){
this->value = INT_MAX;
this->size = 0;
this->lchild = this->rchild = nullptr;
}
}NODE,*PNODE;
PNODE root;
inline PNODE newNode(int x){
return new NODE(x);
}
inline void deleteNode(PNODE &T){
delete T;
T = nullptr;
}
inline bool isLeaf(PNODE T){
return T->lchild == nullptr;
}
inline void pushup(PNODE T){
if(!isLeaf(T)){
T->value = T->rchild->value;
T->size = T->lchild->size + T->rchild->size;
}
}
inline void rotate(PNODE T,bool d){
PNODE temp;
if(!d){
temp = T->rchild;
T->rchild = T->lchild;
T->lchild = T->rchild->lchild;
T->rchild->lchild = T->rchild->rchild;
T->rchild->rchild = temp;
}
else{
temp = T->lchild;
T->lchild = T->rchild;
T->rchild = T->lchild->rchild;
T->lchild->rchild = T->lchild->lchild;
T->lchild->lchild = temp;
}
pushup(T->lchild);
pushup(T->rchild);
pushup(T);
}
inline void maintain(PNODE T){
bool d = 0;
if(!isLeaf(T)){
if(T->lchild->size < T->size * alpha)
d = 1;
else if(T->rchild->size < T->size * alpha)
d = 0;
else
return ;
if(d){
if(T->rchild->lchild->size >= T->rchild->size * (1-2*alpha)/(1-alpha))
rotate(T->rchild,!d);
}
else{
if(T->lchild->rchild->size >= T->lchild->size * (1-2*alpha)/(1-alpha))
rotate(T->lchild,!d);
}
rotate(T,d);
}
}
inline void Insert(PNODE T, int x){
if(isLeaf(T)){
T->lchild = newNode(x);
T->rchild = newNode(T->value);
if(T->lchild->value>T->rchild->value)
swap(T->lchild,T->rchild);
pushup(T);
return;
}
if(T->lchild->value >= x)
Insert(T->lchild,x);
else
Insert(T->rchild,x);
pushup(T);
maintain(T);
}
inline void Delete(PNODE &T,int x){
if(isLeaf(T))
return ;
if(x<=T->lchild->value){
if(isLeaf(T->lchild)){
if(x!=T->lchild->value)
return;
deleteNode(T->lchild);
PNODE buf = T->rchild;
*T = *buf;
deleteNode(buf);
}
else
Delete(T->lchild,x);
}
else{
if(isLeaf(T->rchild)){
if(x!=T->rchild->value)
return ;
deleteNode(T->rchild);
PNODE buf = T->lchild;
*T = *buf;
deleteNode(buf);
}
else
Delete(T->rchild,x);
}
pushup(T);
maintain(T);
}
inline int GetRnk(PNODE T,int x){
if(isLeaf(T))
return 1;
if(x <= T->lchild->value)
return GetRnk(T->lchild,x);
return T->lchild->size + GetRnk(T->rchild,x);
}
inline int GetNum(PNODE T,int rnk){
if(isLeaf(T))
return T->value;
if(rnk <= T->lchild->size)
return GetNum(T->lchild,rnk);
return GetNum(T->rchild,rnk - T->lchild->size);
}
inline int GetPre(PNODE T,int num){
return GetNum(T,GetRnk(T,num)-1);
}
inline int GetSuf(PNODE T,int num){
return GetNum(T,GetRnk(T,num+1));
}
int main(){
root = new NODE;
int n;
cin>>n;
while(n--){
int opt;
cin>>opt;
switch(opt){
case 1:{
int x;
cin>>x;
Insert(root,x);
break;
}
case 2:{
int x;
cin>>x;
Delete(root,x);
break;
}
case 3:{
int x;
cin>>x;
cout<<GetRnk(root,x)<<endl;
break;
}
case 4:{
int x;
cin>>x;
cout<<GetNum(root,x)<<endl;
break;
}
case 5:{
int x;
cin>>x;
cout<<GetPre(root,x)<<endl;
break;
}
case 6:{
int x;
cin>>x;
cout<<GetSuf(root,x)<<endl;
break;
}
}
}
return 0;
}
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