DSA · Theory

Get All Descendants of the Binary Tree Element

Theory

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Get All Descendants of the Binary Tree Element

Ananya only reaches for Get All Descendants of the Binary Tree Element when folder on disk has to stay correct in a file explorer.

Get All Descendants of the Binary Tree Element order: meaning → left < root < right → one limit. Dumping ten features helps nobody.

Get All Descendants of the Binary Tree Element exists so Ananya can keep folder on disk correct in a file explorer.

Use Get All Descendants of the Binary Tree Element when folder on disk must stay clear. If a simpler DSA step works, use that instead.

If folder on disk breaks under Get All Descendants of the Binary Tree Element, check unbalanced BST becoming a list first.

After Get All Descendants of the Binary Tree Element, Ananya should still remember unbalanced BST becoming a list.

Close Get All Descendants of the Binary Tree Element with: “If I skip it, folder on disk goes wrong like this: unbalanced BST becoming a list.”

Exam tip

Board: folder on disk. Dry-run Get All Descendants of the Binary Tree Element. Name the trap: unbalanced BST becoming a list.

Example

class Node:
    def __init__(self, val, left=None, right=None):
        self.val, self.left, self.right = val, left, right

def inorder(n):
    if not n:
        return []
    return inorder(n.left) + [n.val] + inorder(n.right)

root = Node(2, Node(1), Node(3))
print(inorder(root))

Get All Descendants of the Binary Tree Element — inorder walks left → node → right (sorted order for a BST).

Short notes

DefGet All Descendants of the Binary Tree Element — Ananya uses it for folder on disk in a file explorer.
RuleGet All Descendants of the Binary Tree Element → left < root < right.
RememberGet All Descendants of the Binary Tree Element + a dry-run table (a file explorer).
UseGet All Descendants of the Binary Tree Element in a file explorer (folder on disk).
TrapGet All Descendants of the Binary Tree Element — unbalanced BST becoming a list.
ExGet All Descendants of the Binary Tree Element → folder on disk.

class Node: def __init__(self, val, left=None, right=None): self.val, self.left, self.right = val, left, right def inorder(n): if not n: return [] return inorder(n.left) + [n.val] + inorder(n.right) root = Node(2, Node(1), Node(3)) print(inorder(root))

Get All Descendants of the Binary Tree Element

Example

Short notes

Questions

Get All Descendants of the Binary Tree Element

Example

Short notes

Questions