Preorder, Inorder, Postorder | Dataford Interview Questions

Can you describe inorder, preorder, and postorder tree traversals?

Implement all three traversals for a binary tree. The input is a nested dictionary with keys val, left, and right, or None for an empty subtree. Return a dictionary containing the node values in inorder, preorder, and postorder order. Each traversal should visit every node exactly once.

Constraints

0 <= number of nodes <= 10^4
Each node is represented as {"val": value, "left": subtree, "right": subtree}
Node values are integers
The tree may be empty, balanced, or skewed

Function Signature

def tree_traversals(root):

Your question is Preorder, Inorder, Postorder. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Can you describe inorder, preorder, and postorder tree traversals?

Constraints

0 <= number of nodes <= 10^4
Each node is represented as {"val": value, "left": subtree, "right": subtree}
Node values are integers
The tree may be empty, balanced, or skewed

Function Signature

def tree_traversals(root):

Your question is Preorder, Inorder, Postorder. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.