使用Swift实现了BinarySearchTree、AVLTree、RedBlackTree。以及支持输出到控制台console中。
红黑树使用：
let elements = [4, 75, 82, 85, 36, 20, 21, 84, 55, 51, 11, 25, 32, 15, 57, 3]
let rbTree = RedBlackTree<Int>()
elements.forEach { (element) in
rbTree.add(element)
}
debugPrint(rbTree)//打印控制台输出：
36
____________/ \___________
20 75
___/ \__ _____/ \_____
[R]11 25 55 84
/ \ / \ / \ / \
4 15 [R]21 [R]32 [R]51 [R]57 [R]82 [R]85
/
[R]3
[R] 代表红色节点，可自定义输出内容：
class RedBlackNode<Element: Comparable>: Node<Element> {
....
override var debugDescription: String {
return (color == .black ? "" : "[R]") + "\(element)"
}
}二叉树打印到控制台，参考自：
https://stackoverflow.com/questions/43898440/how-to-draw-a-binary-tree-in-console/43903427
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