#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct node
{
    int data, d;
    struct node *l, *r;
};
int max(int a, int b)
{
    return a > b ? a : b;
}
int deep(struct node * root)
{
    if(!root)return -1;
    else return root->d;
}
struct node *LL(struct node * root)
{
    struct node *p;
    p = root->l;
    root->l = p->r;
    p->r = root;
    root->d = max(deep(root->l), deep(root->r)) + 1;
    return p;
};
struct node * RR(struct node *root)
{
    struct node *p;
    p = root->r;
    root->r = p->l;
    p->l = root;
    root->d = max(deep(root->l), deep(root->r)) + 1;
return p;
}
struct node *LR(struct node * root)
{
    root->l = RR(root->l);
    root = LL(root);
    return root;
};
struct node *RL(struct node * root)
{
    root->r = LL(root->r);
    root = RR(root);
    return root;
};
struct node * create(int x, struct node * root)
{
    if(!root)
    {
        root = (struct node * )malloc(sizeof(struct node ));
        root->data = x;
        root->d = 0;
        root->l = NULL;
        root->r = NULL;
    }
    else
    {
        if(x < root->data)
        {
            root->l = create(x, root->l);
            if(deep(root->l) - deep(root->r) > 1)
            {
                if(root->l->data > x)
                    root = LL(root);
                else
                    root = LR(root);
            }
        }
        else if(x > root->data)
        {
            root->r = create(x, root->r);
            if(deep(root->r) - deep(root->l) > 1)
            {
                if(root->r->data < x)
                root = RR(root);
                else
                    root = RL(root);
            }
        }
    }
    root->d = max(deep(root->r), deep(root->l)) + 1;
    return root;
};