C# 逐层反向打印二叉树

奇数层从左到右打印，偶数层从右到左打印。

例如：

a

b c

d e f g

输出则为 a c b d e f g

void SpecialPrintTrees(node root)
{
    Node temp;
    Stack stack1 = new Stack();
    Stack stack2 = new Stack();
    stack1.Push(root);
    while(stack1.Count>0||stack2.Count>0)
    {
        while(stack1.Count>0)
        {
            temp = stack1.Pop();
            if(temp.Left!=null)
                Stack2.Push(temp.Left);
            if(temp.Right!=null)
                Stack2.Push(temp.Right);
            Console.Write(temp.Value);
        }
        while(stack2.Count>0)
        {
            temp = stack2.Pop();
            if(temp.Right!=null)
                Stack1.Push(temp.Right);
            if(temp.Left!=null)
                Stack1.Push(temp.Left);
            Console.Write(temp.Value);
        }    
    }
}