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equivalent binary tree
package main
import (
func Walk(t *tree.Tree, ch chan int) {
_Walk(t, ch)
// Walk walks the tree t sending all values
// from the tree to the channel ch.
func _Walk(t *tree.Tree, ch chan int) {
if t.Left != nil {
_Walk(t.Left, ch)
ch <- t.Value
if t.Right != nil {
_Walk(t.Right, ch)
// Same determines whether the trees
// t1 and t2 contain the same values.
func Same(t1, t2 *tree.Tree) bool {
ch1, ch2 := make(chan int), make(chan int)
go Walk(t1, ch1)
go Walk(t2, ch2)
for i := range ch1 {
if i != <- ch2 {
return false
return true
func main() {
fmt.Println(Same(tree.New(1), tree.New(1)))
fmt.Println(Same(tree.New(1), tree.New(2)))
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