Go实现如下:
package main
import . "nc_tools"
/*
* type TreeNode struct {
* Val int
* Left *TreeNode
* Right *TreeNode
* }
*/
/**
*
* @param root TreeNode类
* @return int整型
*/
func maxDepth( root *TreeNode ) int {
// write code here
if root == nil {
return 0
}
left:= maxDepth(root.Left)
right:= maxDepth(root.Right)
return max(left, right) + 1
}
func max(a, b int) int {
if a > b {
return a
}
return b
}


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