DSA · Theory

The Great Tree-List Recursion Problem

Theory

671/810

The Great Tree-List Recursion Problem

The Great Tree-List Recursion Problem (alt) 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 The Great Tree-List Recursion Problem (alt).

From the example next to this theory: The Great Tree-List Recursion Problem (alt) — recursion solves a problem using smaller instances of itself + a base case.

Trap — unbalanced BST becoming a list. Fix that before you talk about advanced DSA.

Viva — what is The Great Tree-List Recursion Problem (alt)? Then show left < root < right. Then name the trap.

Exam tip

What is The Great Tree-List Recursion Problem (alt)? Show this: left < root < right. Trap: unbalanced BST becoming a list.

Example

def factorial(n):
    if n <= 1:
        return 1
    return n * factorial(n - 1)

print(factorial(5))

The Great Tree-List Recursion Problem (alt) — recursion solves a problem using smaller instances of itself + a base case.

Short notes

DefThe Great Tree-List Recursion Problem (alt) — folder on disk in a file explorer.
Ruleleft < root < right
Trapunbalanced BST becoming a list
Usea file explorer

DSA · Theory

The Great Tree-List Recursion Problem

← All stacks

Theory

671/810

The Great Tree-List Recursion Problem

The Great Tree-List Recursion Problem (alt) 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 The Great Tree-List Recursion Problem (alt).

From the example next to this theory: The Great Tree-List Recursion Problem (alt) — recursion solves a problem using smaller instances of itself + a base case.

Trap — unbalanced BST becoming a list. Fix that before you talk about advanced DSA.

Viva — what is The Great Tree-List Recursion Problem (alt)? Then show left < root < right. Then name the trap.

Exam tip

What is The Great Tree-List Recursion Problem (alt)? Show this: left < root < right. Trap: unbalanced BST becoming a list.

Example

def factorial(n):
    if n <= 1:
        return 1
    return n * factorial(n - 1)

print(factorial(5))

The Great Tree-List Recursion Problem (alt) — recursion solves a problem using smaller instances of itself + a base case.

Short notes

DefThe Great Tree-List Recursion Problem (alt) — folder on disk in a file explorer.
Ruleleft < root < right
Trapunbalanced BST becoming a list
Usea file explorer

The Great Tree-List Recursion Problem

Example

Short notes

Questions

The Great Tree-List Recursion Problem

Example

Short notes

Questions