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DSA · Theory

Alien Dictionary problem in dsa

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Theory

610/810

Alien Dictionary problem in dsa

If you can teach Alien Dictionary problem (in dsa) using name → phone, you know it. If you only know the heading, you don’t.

Alien Dictionary problem (in dsa) order: meaning → key % size + collision plan → one limit. Dumping ten features helps nobody.

Without Alien Dictionary problem (in dsa), a diary gets messy and name → phone is hard to trust.

Alien Dictionary problem (in dsa) shows up in a diary. Name name → phone, not “a real-world scenario”.

Alien Dictionary problem (in dsa) miss — bad hash → pile-up. Fix it before you talk about advanced DSA.

After Alien Dictionary problem (in dsa), Meera should still remember bad hash → pile-up.

Close Alien Dictionary problem (in dsa) with: “If I skip it, name → phone goes wrong like this: bad hash → pile-up.”

Exam tip

For Alien Dictionary problem (in dsa): definition + a diary + one failure.

Example

# Alien Dictionary problem in dsa
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)

Alien Dictionary problem in dsa: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefAlien Dictionary problem (in dsa) — Meera uses it for name → phone in a diary.
  • RuleAlien Dictionary problem (in dsa) → key % size + collision plan.
  • RememberAlien Dictionary problem (in dsa) + time vs memory (a diary).
  • UseAlien Dictionary problem (in dsa) in a diary (name → phone).
  • TrapAlien Dictionary problem (in dsa) — bad hash → pile-up.
  • ExAlien Dictionary problem (in dsa) → name → phone.

Questions

1

Meera asks: why does Alien Dictionary problem (in dsa) exist? Use name → phone.

2

Where does Alien Dictionary problem (in dsa) show up in a diary?

3

Viva: one wrong answer people give for Alien Dictionary problem (in dsa).

4

Change one input on name → phone. Predict the new result.

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