This library allows you to use three types of binary search trees: simple, AVL and Red-Black tree. AVL and Red-Black tree implement their natural balancing.

1. Download our lib from Releases
2. Open your project
3. Go to File > New > Module from Existing Sources...
4. Choose the lib you downloaded
5. Add this in your program:

  import trees.*

You can replace * with any specific tree

There are 4 public methods you can use for each tree:

• insert(key, value) inserts a node with such key and value. If a node with the same key already exists in the tree, old value is replaced with the new one. Note that key should be of Comparable type.
• delete(key) deletes a node with such key. If there is no node with that key, nothing is done.
• find(key) finds a node with such key and returns its value. If there is no node with that key, null is returned.
• preorderTraverse() traverses the tree recursively from parent to left child to right child (specific for every tree)

Now you can simply create a tree: BSTree, AVLTree or RBTree:

  val tree = RBTree<Int, String>()

Start inserting and deleting nodes:

  tree.insert(11, "Welcome to the jungle")                
  tree.insert(9, "We got fun and games")
  tree.insert(27, "We take it day by day")
  tree.delete(11)
  val value1 = find(9)  // value = "We got fun and games"
  val value2 = find(15) // value = null

Here are some examples for traversing each tree:

For BSTree it saves node's key:

  val bstree = BSTree<Int, String>()
  bstree.insert(99, "Empty spaces")
  bstree.insert(88, "What are we living for?")
  bstree.insert(77, "Abandonded places")
  val myList = bstree.preorderTraverse() // myList = [99, 88, 77]

For AVLTree it saves node's key and height:

  val avltree = AVLTree<Int, String>()
  avltree.insert(11, "When you were here before")
  avltree.insert(1, "Couldn't look you in the eye")
  avltree.insert(111, "You're just like an angel")
  val myList = avltree.preorderTraverse() // myList = [(11, 2), (1, 1), (111, 1)]

For RBTree it saves node's key and color:

  val rbtree = RBTree<Int, String>()
  rbtree.insert(30, "...we built this house")
  rbtree.insert(20, "On memories")
  rbtree.insert(25, "Take my picture now")
  val myList = rbtree.preorderTraverse() // myList = [(25, BLACK), (20, RED), (30, RED)]

Have fun!

• p1onerka (tg @p10nerka)
• sofyak0zyreva (tg @soffque)
• shvorobsofia (tg @fshv23)

The product is distributed under MIT license. Check LICENSE for more information