Two dimensional Binary Indexed Tree or Fenwick Tree — DSA Technical Interview Questions & Answers

Two dimensional Binary Indexed Tree or Fenwick Tree

Two dimensional Binary Indexed Tree or Fenwick Tree

  • Two dimensional Binary Indexed Tree or Fenwick Tree is a DSA topic. In plain words you use it for folder on disk in a file explorer. Don’t start with a slogan — start with that picture.
  • Smallest example: left < root < right. Type it, run it, and say what you see. If you can do that from memory, you know Two dimensional Binary Indexed Tree or Fenwick Tree.
  • From the example next to this theory: Two dimensional Binary Indexed Tree or Fenwick Tree: dry-run [4, 1, 3].
  • Trap: unbalanced BST becoming a list. Fix that before you talk about advanced DSA.
  • Viva: what is Two dimensional Binary Indexed Tree or Fenwick Tree? Then show left < root < right. Then name the trap.

Technical Interview Tip: What is Two dimensional Binary Indexed Tree or Fenwick Tree? Show this: left < root < right. Trap: unbalanced BST becoming a list.

Code Examples for Two dimensional Binary Indexed Tree or Fenwick Tree

Two dimensional Binary Indexed Tree or Fenwick Tree — working example

# Two dimensional Binary Indexed Tree or Fenwick Tree
data = [4, 1, 3]
print("start", data)
if data[0] > data[1]:
    data[0], data[1] = data[1], data[0]
print("after one step", data)

Two dimensional Binary Indexed Tree or Fenwick Tree: dry-run [4, 1, 3]. Say the list after one step.

How to Explain Two dimensional Binary Indexed Tree or Fenwick Tree to an Interviewer

What is Two dimensional Binary Indexed Tree or Fenwick Tree?

Used for folder on disk a file explorer Not just the heading

Give one small example of Two dimensional Binary Indexed Tree or Fenwick Tree.

left < root < right Two dimensional Binary Indexed Tree or Fenwick Tree: dry-run [4, 1, 3]

What mistake do beginners make with Two dimensional Binary Indexed Tree or Fenwick Tree?

unbalanced BST becoming a list Show the fix

Where do you use Two dimensional Binary Indexed Tree or Fenwick Tree?

a file explorer folder on disk