What is the BST inorder algorithm? The inorder algorithm returns values in ascending order (sorted from smallest to the largest value). Code example final class BSTNode<Value: Comparable> { var val: Value? var left: BSTNode? var right: BSTNode? init(val: Value? = nil) { self.val = val } func inorder(_ visited: inout [Value]) -> [Value] { if self.left != nil { self.left!.inorder(&visited) } if self.val != nil { visited.append(self.val!) } if self.right !...
Code Example final class BSTNode<Value: Comparable> { var val: Value? var left: BSTNode? var right: BSTNode? init(val: Value? = nil) { self.val = val } func exists(_ val: Value) -> Bool { // 1 guard let selfVal = self.val else { return false } // 2 if self.val == val { return true } // 3 if val < self.val! { if self.left == nil { return false } return self....
What is the postorder algorithm? The postorder algorithm, similar to the preorder algorithm, returns a list of values in the order they are visited. Code Example final class BSTNode<Value: Comparable> { var val: Value? var left: BSTNode? var right: BSTNode? init(val: Value? = nil) { self.val = val } func postorder(_ visited: inout [Value]) -> [Value] { if self.left != nil { self.left!.postorder(&visited) } if self.right != nil { self.right!.postorder(&visited) } if self....
What is tree traversal? Tree traversal, also known as “tree search” or “walking the tree,” is the process of visiting each node in a tree data structure exactly once. What is the BST preorder algorithm? The preorder algorithm returns a list of values in the order they are visited. It makes a copy that preserves the structure and recursively traverses the BST. Code example func preorder(_ visited: inout [Value]) -> [Value] { if self....
Introduction The delete algorithm is perhaps one of the hardest parts of managing a binary search tree (BST). Code Example final class BSTNode { var val: Int? var left: BSTNode? var right: BSTNode? init(val: Int? = nil) { self.val = val } func delete(_ val: Int) -> BSTNode? { // 1 guard let selfVal = self.val else { return nil } // 2 if val < selfVal { if self.left == nil { return self } self....