DSA · Theory

Find Immediate Parents of Two Nodes in a Binary Tree

Theory

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Find Immediate Parents of Two Nodes in a Binary Tree

If you can teach Find Immediate Parents of Two Nodes in a Binary Tree using folder on disk, you know it. If you only know the heading, you don’t.

Find Immediate Parents of Two Nodes in a Binary Tree order: meaning → left < root < right → one limit. Dumping ten features helps nobody.

Find Immediate Parents of Two Nodes in a Binary Tree exists so Asha can keep folder on disk correct in a file explorer.

Use Find Immediate Parents of Two Nodes in a Binary Tree when folder on disk must stay clear. If a simpler DSA step works, use that instead.

If folder on disk breaks under Find Immediate Parents of Two Nodes in a Binary Tree, check unbalanced BST becoming a list first.

Place Find Immediate Parents of Two Nodes in a Binary Tree next to nearby DSA work — left < root < right is the link.

Viva for Find Immediate Parents of Two Nodes in a Binary Tree: what it is → left < root < right → the mistake (unbalanced BST becoming a list).

Exam tip

Board: folder on disk. Dry-run Find Immediate Parents of Two Nodes in a Binary Tree. 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))

Find Immediate Parents of Two Nodes in a Binary Tree — inorder walks left → node → right (sorted order for a BST).

Short notes

DefFind Immediate Parents of Two Nodes in a Binary Tree — Asha uses it for folder on disk in a file explorer.
RuleFind Immediate Parents of Two Nodes in a Binary Tree → left < root < right.
RememberFind Immediate Parents of Two Nodes in a Binary Tree + a dry-run table (a file explorer).
UseFind Immediate Parents of Two Nodes in a Binary Tree in a file explorer (folder on disk).
TrapFind Immediate Parents of Two Nodes in a Binary Tree — unbalanced BST becoming a list.
ExFind Immediate Parents of Two Nodes in a Binary Tree → 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))

Find Immediate Parents of Two Nodes in a Binary Tree

Example

Short notes

Questions

Find Immediate Parents of Two Nodes in a Binary Tree

Example

Short notes

Questions