package main

type TNode struct {
	Val   int
	Left  *TNode
	Right *TNode
}

func Invert(root *TNode) {
	if root != nil {
		temp := root.Left
		root.Left = root.Right
		root.Right = temp

		Invert(root.Left)
		Invert(root.Right)
	}
}

func InvertTree(root *TNode) *TNode {
	Invert(root)
	return root
}

func main() {
}