#include <bits/stdc++.h>
using namespace std;
#define ll long long
class OList
{
    public:
        int data;
        OList* lAdress;
        OList* rAdress;
        OList()
        {
            lAdress = nullptr;
            rAdress = nullptr;
            data = 0;
        }
        void add(OList* &tail, int data)
        {
            OList* stepGO = tail;
            OList* temp = new OList;
            if(tail == nullptr)
            {
                temp->rAdress = nullptr;
                temp->lAdress = nullptr;
                temp->data = data;
                tail = temp;
            }
            while(stepGO->rAdress != nullptr && data > stepGO->data)
                stepGO = stepGO->rAdress;
            temp->lAdress = stepGO;
            if(stepGO->rAdress != nullptr) (stepGO->rAdress)->lAdress = temp;
            temp->data = data;
            stepGO->rAdress = temp;
        }
        ll removeEl(OList* &tail,int value)
        {
            OList* stepGO = tail;
            while(stepGO->rAdress != nullptr && data != stepGO->data)
                stepGO = stepGO->rAdress;
            if(stepGO->data != data) return 2147483648;
            else
            {

            }
        }

};
int main()
{
    OList* a = new OList;
    return 0;
}