DSA · Theory

Get the Level of a Given Key in a Binary Tree

Theory

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Get the Level of a Given Key in a Binary Tree

If you can teach Get the Level of a Given Key in a Binary Tree (btree alt) using folder on disk, you know it. If you only know the heading, you don’t.

Get the Level of a Given Key in a Binary Tree (btree alt) order: meaning → left < root < right → one limit. Dumping ten features helps nobody.

Skip Get the Level of a Given Key in a Binary Tree (btree alt) and unbalanced BST becoming a list shows up in a file explorer.

Get the Level of a Given Key in a Binary Tree (btree alt) shows up in a file explorer. Name folder on disk, not “a real-world scenario”.

Don’t do this with Get the Level of a Given Key in a Binary Tree (btree alt): unbalanced BST becoming a list. Interviewers spot it in ten seconds.

After Get the Level of a Given Key in a Binary Tree (btree alt), Ananya should still remember unbalanced BST becoming a list.

Close Get the Level of a Given Key in a Binary Tree (btree alt) with: “If I skip it, folder on disk goes wrong like this: unbalanced BST becoming a list.”

Exam tip

Say Get the Level of a Given Key in a Binary Tree (btree alt) in one breath, then left < root < right, then 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 the Level of a Given Key in a Binary Tree (btree alt) — inorder walks left → node → right (sorted order for a BST).

Short notes

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

Example

Short notes

Questions

Get the Level of a Given Key in a Binary Tree

Example

Short notes

Questions