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DSA · Theory

Friends pairing problem

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Theory

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Friends pairing problem

Don’t start Friends pairing problem with jargon. Start with Arun walking through Friends pairing problem. That is the whole point.

Keep Friends pairing problem small. Arun should finish Arun walking through Friends pairing problem in a few lines, not a 40-line dump.

Without Friends pairing problem, a first job task gets messy and Arun walking through Friends pairing problem is hard to trust.

Use Friends pairing problem when Arun walking through Friends pairing problem must stay clear. If a simpler DSA step works, use that instead.

Don’t do this with Friends pairing problem: skipping the failure case for Friends pairing problem. Interviewers spot it in ten seconds.

After Friends pairing problem, Arun should still remember skipping the failure case for Friends pairing problem.

Viva for Friends pairing problem: what it is → one Friends pairing problem step Arun can write from memory → the mistake (skipping the failure case for Friends pairing problem).

Exam tip

For Friends pairing problem: definition + a first job task + one failure.

Example

# Friends pairing problem
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)

Friends pairing problem: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefFriends pairing problem — Arun uses it for Arun walking through Friends pairing problem in a first job task.
  • RuleFriends pairing problem → one Friends pairing problem step Arun can write from memory.
  • RememberFriends pairing problem + Big-O (a first job task).
  • UseFriends pairing problem in a first job task (Arun walking through Friends pairing problem).
  • TrapFriends pairing problem — skipping the failure case for Friends pairing problem.
  • ExFriends pairing problem → Arun walking through Friends pairing problem.

Questions

1

Define Friends pairing problem without jargon. Then point at Arun walking through Friends pairing problem.

2

Name one DSA screen/job that needs Friends pairing problem.

3

Viva: one wrong answer people give for Friends pairing problem.

4

Write the smallest Friends pairing problem step on Arun walking through Friends pairing problem. What happens?

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