以非递归方式获取二叉树节点的深度 [英] Retrieving a Binary-Tree node's depth non-recursively
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问题描述
任何人都可以指出一种无需使用递归即可获取二叉树(非平衡树或BST)中二叉树深度的方法吗?理想地使用Java/C/C#
Can anyone point out a way of getting the depth of a Node in a Binary Tree (not a balanced one, or BST) without using recursion? Ideally in Java/C/C#
该节点表示为:
class Node
{
Node Left;
Node Right;
string Value;
int Depth;
}
将等级顺序与FIFO列表结合使用是我的第一个想法,但是我很困惑地检测到等级何时发生变化,尤其是对于不平衡的树木.
Using Level Order with a FIFO list was my first thought, but I was stumped at detecting when the level changes, particular for unbalanced trees.
推荐答案
您可以使用堆栈实现任何递归方法,无论如何,这都是递归的工作方式.想象一下您的递归函数看起来像
You can implement any resursive method with a stack, which is how resursion works anyways. Imagine your resursive function looks like
function int getDepth (Node head, string val)
{
if (head == NULL)
return -1;
if (val == head.Value)
return head.Depth;
return MAX(getDepth(head.Left, val), getDepth(head.Right, val);
}
非递归函数看起来像
function int getDepth (Node head, string val)
{
Stack s = new Stack();
s.push(head);
while(s.count > 0)
{
Node temp = s.pop();
if (temp != NULL)
{
if (s.Value == val)
return s.Depth;
else
{
s.push(temp.Left);
s.push(temp.Right);
}
}
}
return -1;
}
此功能设置每个节点的深度
This function sets the depth for each node
function void setDepth (Node head)
{
Stack s = new Stack();
head.Depth = 0;
s.push(head);
while(s.count > 0)
{
Node temp = s.pop();
if (temp != NULL)
{
if (temp.Left != NULL)
{
temp.Left.Depth = temp.Depth + 1;
s.push(temp.Left);
}
if (temp.Right != NULL)
{
temp.Right.Depth = temp.Depth + 1;
s.push(temp.Right);
}
}
}
}
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