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package maximum_depth_of_binary_tree
import serialize_and_deserialize_binary_tree "github.com/masx200/leetcode-test/serialize-and-deserialize-binary-tree"
type TreeNode = serialize_and_deserialize_binary_tree.TreeNode
func maxDepth(root *TreeNode) int {	if root == nil {		return 0	} else {		return max(maxDepth(root.Left), maxDepth(root.Right)) + 1	}}func max(a, b int) int {	if a > b {		return a	}	return b}