#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>

typedef int TElement;

typedef struct TNode {
    TElement data;
    struct TNode* left;
    struct TNode* right;
} TNode;

#define KEY(n) ((n)->data)
#define VisitNode(n) (printf("%d ", (n)->data))

TNode* create_tree(TElement data, TNode* left, TNode* right)
{
    TNode* n = (TNode*)malloc(sizeof(TNode));
    n->data = data;
    n->left = left;
    n->right = right;
    return n;
}

void insert_bst(TNode* root, TNode* n)
{
    if (KEY(n) < KEY(root)) {
        if (root->left == NULL)
            root->left = n;
        else
            insert_bst(root->left, n);
    }
    else if (KEY(n) > KEY(root)) {
        if (root->right == NULL)
            root->right = n;
        else
            insert_bst(root->right, n);
    }
}

void inorder(TNode* n)
{
    if (n != NULL) {
        inorder(n->left);
        VisitNode(n);
        inorder(n->right);
    }
}

int main()
{
    int keys[] = { 10, 55, 44, 88, 33, 22, 99 };

    TNode* root = create_tree(keys[0], NULL, NULL);

    for (int i = 1; i < 7; i++) {
        TNode* n = create_tree(keys[i], NULL, NULL);
        insert_bst(root, n);
    }

    inorder(root);

    return 0;
}