DSA · Theory

WORD LADDER

Theory

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If you can teach WORD LADDER using Ananya walking through WORD LADDER, you know it. If you only know the heading, you don’t.

Keep WORD LADDER small. Ananya should finish Ananya walking through WORD LADDER in a few lines, not a 40-line dump.

Skip WORD LADDER and skipping the failure case for WORD LADDER shows up in lab hour.

Use WORD LADDER when Ananya walking through WORD LADDER must stay clear. If a simpler DSA step works, use that instead.

If Ananya walking through WORD LADDER breaks under WORD LADDER, check skipping the failure case for WORD LADDER first.

WORD LADDER is not a lonely heading. Ananya ties it to Ananya walking through WORD LADDER.

Viva for WORD LADDER: what it is → one WORD LADDER step Ananya can write from memory → the mistake (skipping the failure case for WORD LADDER).

Exam tip

Say WORD LADDER in one breath, then one WORD LADDER step Ananya can write from memory, then skipping the failure case for WORD LADDER.

# 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.

DefWORD LADDER — Ananya uses it for Ananya walking through WORD LADDER in lab hour.
RuleWORD LADDER → one WORD LADDER step Ananya can write from memory.
RememberWORD LADDER + a dry-run table (lab hour).
UseWORD LADDER in lab hour (Ananya walking through WORD LADDER).
TrapWORD LADDER — skipping the failure case for WORD LADDER.
ExWORD LADDER → Ananya walking through WORD LADDER.