104. Maximum Depth of Binary Tree #
题目 #
Given a binary tree, find its maximum depth.
The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.
Note: A leaf is a node with no children.
Example:
Given binary tree [3,9,20,null,null,15,7],
3
/ \
9 20
/ \
15 7
return its depth = 3.
题目大意 #
要求输出一棵树的最大高度。
解题思路 #
这一题递归遍历就可,遍历根节点的左孩子的高度和根节点右孩子的高度,取出两者的最大值再加一即为总高度。
代码 #
package leetcode
/**
* Definition for a binary tree node.
* type TreeNode struct {
* Val int
* Left *TreeNode
* Right *TreeNode
* }
*/
func maxDepth(root *TreeNode) int {
if root == nil {
return 0
}
return max(maxDepth(root.Left), maxDepth(root.Right)) + 1
}