int tree_balanced (struct Node * tree)
{
if (tree == NULL)
return 1;
else
if (tree_balanced(tree->left) && tree_balanced(tree->right) && ((tree_height(tree->left) - tree_height(tree->right)) <= 1) && ((tree_height(tree->left) - tree_height(tree->right)) >= -1))
return 1;
else
return 0;
}
int main() {
MemoryPool *pool = memory_pool_init(sizeof(int) * 100);
BinarySearchTree *tree = binary_search_tree_init(int_compare_by_pointer,
int_compare_by_pointer);
binary_search_tree_insert(tree, memory_pool_alloc_int(pool, 2), NULL);
binary_search_tree_insert(tree, memory_pool_alloc_int(pool, 1), NULL);
binary_search_tree_insert(tree, memory_pool_alloc_int(pool, 3), NULL);
int height = 0;
assert(true == tree_balanced(tree));
tree = binary_search_tree_free(tree);
// Construct an almost balanced tree.
tree = binary_search_tree_init(int_compare_by_pointer,int_compare_by_pointer);
int keys[] = {5, 3, 6, 2, 4, 1};
for (size_t i = 0; i < sizeof(keys)/sizeof(int); ++i) {
binary_search_tree_insert(tree, memory_pool_alloc_int(pool, keys[i]), NULL);
}
assert(false == tree_balanced(tree));
tree = binary_search_tree_free(tree);
pool = memory_pool_free(pool);
}
int main()
{
struct Node * tree = NULL;
int nn;
scanf("%d", &nn);
while (nn > 0)
{
tree = tree_add(tree, nn);
scanf("%d", &nn);
};
printf("%s\n", tree_balanced(tree)?"YES":"NO");
tree_destroy(tree);
return 0;
}