83 lines
2.2 KiB
C#
83 lines
2.2 KiB
C#
using C_.Datastructures.BinarySearchTree;
|
|
using System;
|
|
|
|
namespace C_.Datastructures.BinarySearchTree
|
|
{
|
|
internal class Tree<T> where T:IComparable
|
|
{
|
|
public TreeNode<T>? Root { get; set; }
|
|
public int Count { get; set; }
|
|
|
|
public Tree<T> Create(){
|
|
//Create a new Tree with no Head
|
|
return new Tree<T>{
|
|
Root = null,
|
|
Count = 0
|
|
};
|
|
}
|
|
public Tree<T> Create(T? value){
|
|
//Create a new Tree with Head
|
|
return new Tree<T>{
|
|
Root = TreeNode<T>.Create(value)
|
|
};
|
|
}
|
|
|
|
public void Add(T value)
|
|
{//Add item to the correct position in the tree (Input cannot be null)
|
|
Count++;
|
|
|
|
if (Root == default)
|
|
{//If new node should become the root
|
|
Root = TreeNode<T>.Create(value);
|
|
return;
|
|
}
|
|
|
|
//Find position to insert
|
|
TreeNode<T> node = Root;
|
|
node = Descend(value, node)!;
|
|
|
|
if (value.CompareTo(node.Value) < 0)
|
|
{//Insert to left
|
|
node.Left = TreeNode<T>.Create(value);
|
|
return;
|
|
}
|
|
//Insert to right
|
|
node.Right = TreeNode<T>.Create(value);
|
|
return;
|
|
|
|
|
|
}
|
|
|
|
public bool Find(T value){
|
|
var x = Descend(value, Root);
|
|
return true;
|
|
}
|
|
|
|
private TreeNode<T>? Descend(T value, TreeNode<T>? current)
|
|
{//Keep trying to determine whether to go left or right until null node is found that can be appended to
|
|
if (current == default)
|
|
return default;
|
|
|
|
TreeNode<T>? node;
|
|
|
|
if (value.CompareTo(current.Value) < 0)
|
|
{//Descend left
|
|
node = Descend(value, current.Left);
|
|
if (node == null)
|
|
{
|
|
return current;
|
|
}
|
|
return node;
|
|
}
|
|
else
|
|
{//Descend right
|
|
node = Descend(value, current.Right);
|
|
if (node == null)
|
|
{
|
|
return current;
|
|
}
|
|
return node;
|
|
}
|
|
}
|
|
}
|
|
} |