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September 14, 2023 10:56
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Interactive and Recursive approach in golang
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package main | |
import ( | |
"container/list" | |
"fmt" | |
) | |
type Node struct { | |
Key int | |
Left *Node | |
Right *Node | |
} | |
type BinarySearchTree struct { | |
Root *Node | |
} | |
func (tree *BinarySearchTree) Insert(key int) { | |
newNode := &Node{Key: key} | |
if tree.Root == nil { | |
tree.Root = newNode | |
return | |
} | |
current := tree.Root | |
for { | |
if key < current.Key { | |
if current.Left == nil { | |
current.Left = newNode | |
return | |
} | |
current = current.Left | |
} else { | |
if current.Right == nil { | |
current.Right = newNode | |
return | |
} | |
current = current.Right | |
} | |
} | |
} | |
func (tree *BinarySearchTree) BFS() []int { | |
result := []int{} | |
if tree.Root == nil { | |
return result | |
} | |
queue := list.New() | |
queue.PushBack(tree.Root) | |
for queue.Len() > 0 { | |
node := queue.Remove(queue.Front()).(*Node) | |
result = append(result, node.Key) | |
if node.Left != nil { | |
queue.PushBack(node.Left) | |
} | |
if node.Right != nil { | |
queue.PushBack(node.Right) | |
} | |
} | |
return result | |
} | |
func (tree *BinarySearchTree) BFSRecursive() []int { | |
result := []int{} | |
if tree.Root == nil { | |
return result | |
} | |
queue := list.New() | |
queue.PushBack(tree.Root) | |
return tree.bfsrec(queue, result) | |
} | |
func (tree *BinarySearchTree) bfsrec(queue *list.List, result []int) []int { | |
if queue.Len() == 0 { | |
return result | |
} | |
node := queue.Remove(queue.Front()).(*Node) | |
result = append(result, node.Key) | |
if node.Left != nil { | |
queue.PushBack(node.Left) | |
} | |
if node.Right != nil { | |
queue.PushBack(node.Right) | |
} | |
return tree.bfsrec(queue, result) | |
} | |
func main() { | |
bst := BinarySearchTree{} | |
bst.Insert(50) | |
bst.Insert(30) | |
bst.Insert(70) | |
bst.Insert(20) | |
bst.Insert(40) | |
bst.Insert(60) | |
bst.Insert(80) | |
fmt.Println("Breadth-First Search:") | |
fmt.Println(bst.BFS()) // Should print [50 30 70 20 40 60 80] | |
fmt.Println(bst.BFSRecursive()) // Should print [50 30 70 20 40 60 80] | |
} |
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