二叉树类定义
public class BinaryNode<T>
{
public T Element;
public BinaryNode<T> Left;
public BinaryNode<T> Right;
public BinaryNode(T element, BinaryNode<T> left, BinaryNode<T> right)
{
this.Element = element;
this.Left = left;
this.Right = right;
}
public bool IsLeaf()
{
if (Left == null && Right == null)
return true;
else
return false;
}
}
获取二叉树的深度
public int GetDepth(BTreeNode node)
{
if(node == null)
return 0;
else
{
int d1=GetDepth(node.LNode);
int d2=GetDepth(node.RNode);
}
return d1>d2?d1++:d2++;
}
public int GetDepthNoRecursive(BTreeNode root)
{
Queue<int> que = new Queue<int>();
while(root!=null)
{
}
}
二叉树广度优先遍历
先序遍历: 先访问节点本身在访问左子节点最后是右子节点.
二叉树的前序遍历：
public void PreOrder(BinaryNode<T> root)
{
if (root == null)
return;
//visit current node
Console.WriteLine(root.Element);
PreOrder(root.Left);
PreOrder(root.Right);
}
二叉树前序遍历 非递归算法：
public void PreOrderNoRecursive(BinaryNode<T> root)
{
if (root == null)
return;
Stack<BinaryNode<T>> stack = new Stack<BinaryNode<T>>();
while(root !=null || stack.Count > 0)
{
while(root != null){
stack.Push(root);
Console.WriteLine(root.Element);
root = root.Left;
}
if(stack.Count > 0)
{
root = stack.Pop();
root = root.Right;
}
}
}
二叉树中序遍历
InOrder visit
二叉树中序遍历 递归算法
public void InOrder(BinaryNode<T> root)
{
if(root == null) return;
InOrder(root.Left);
Console.WriteLine(root.Element);
InOrder(root.Right);
}
二叉树中序遍历 非递归算法
public void InOrderNoRecursive(BinaryNode<T> root)
{
if(root == null)
return;
Stack<BinaryNode<T>> stack = new Stack<BinaryNode<T>>();
while(root!=null || stack.Count>0 )
{
while (root != null)
{
stack.Push(root);
root = root.Left;
}
if(stack.Count > 0)
{
root = stack.Pop();
Console.WriteLine(root.Element);
root = root.Right
}
}
}
后序遍历
public void PostOrder(BinaryNode<T> root){
if(root == null)
return;
PostOrder(root.Left);
PostOrder(root.Right);
}
public void PostOrderNoRecursive(BinaryNode<T> root)
{
if(root == null)
return;
Stack<BinaryNode<T>> stack = new Stack<BinaryNode<T>>();
while(root != null || stack.Count>0){
while(root!= null)
{
stack.Push(root);
if(root.left != null)
root = root.Left;
else
root = root.right;
}
root = stack.Pop();
Console.WriteLine(root.Element);
if(stack.Count>0 && root == stack.Peek().Left)
{
root = stack.Peek().Right;
}
else
{
root = null;
}
}
}
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