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DSA · Theory

WORD LADDER

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Theory

722/810

WORD LADDER

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

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

From the example next to this theory — WORD LADDER: dry-run [4, 1, 3].

Trap — only saying “WORD LADDER” with no example. Fix that before you talk about advanced DSA.

Viva — what is WORD LADDER? Then show the smallest WORD LADDER example you can type. Then name the trap.

Exam tip

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

Example

# WORD LADDER
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)

WORD LADDER: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefWORD LADDER — a short WORD LADDER example in a short dry-run on paper.
  • Rulethe smallest WORD LADDER example you can type
  • Traponly saying “WORD LADDER” with no example
  • Usea short dry-run on paper

Questions

1

What is WORD LADDER?

2

Give one small example of WORD LADDER.

3

What mistake do beginners make with WORD LADDER?

4

Where do you use WORD LADDER?

722 / 810

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