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DSA · Theory

Product Array Puzzle

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Theory

589/810

Product Array Puzzle

Product Array Puzzle is a DSA topic. In plain words you use it for a short Product Array Puzzle example in a short dry-run on paper. Don’t start with a slogan — start with that picture.

Smallest example: the smallest Product Array Puzzle example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Product Array Puzzle.

From the example next to this theory: Product Array Puzzle — arrays give O(1) index access; matrices are arrays of arrays.

Trap — only saying “Product Array Puzzle” with no example. Fix that before you talk about advanced DSA.

Viva: what is Product Array Puzzle? Then show the smallest Product Array Puzzle example you can type. Then name the trap.

Diagram
  index →  0    1    2
  array → [10,  20,  30]
Exam tip

What is Product Array Puzzle? Show this: the smallest Product Array Puzzle example you can type. Trap: only saying “Product Array Puzzle” with no example.

Example

arr = [10, 20, 30, 40]
print(arr[2], arr[-1])
matrix = [[1, 2], [3, 4]]
print(matrix[1][0])  # 3

Product Array Puzzle — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

  • DefProduct Array Puzzle — a short Product Array Puzzle example in a short dry-run on paper.
  • Rulethe smallest Product Array Puzzle example you can type
  • Traponly saying “Product Array Puzzle” with no example
  • Usea short dry-run on paper

Questions

1

What is Product Array Puzzle?

2

Give one small example of Product Array Puzzle.

3

What mistake do beginners make with Product Array Puzzle?

4

Where do you use Product Array Puzzle?

589 / 810

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