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DSA · Theory

Find Triplets with zero-sum

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Theory

608/810

Find Triplets with zero-sum

Find Triplets with zero-sum is simple if you keep it on paper. Amit uses it for Amit walking through Find Triplets with zero-sum in lab hour.

Keep Find Triplets with zero-sum small. Amit should finish Amit walking through Find Triplets with zero-sum in a few lines, not a 40-line dump.

Without Find Triplets with zero-sum, lab hour gets messy and Amit walking through Find Triplets with zero-sum is hard to trust.

Find Triplets with zero-sum shows up in lab hour. Name Amit walking through Find Triplets with zero-sum, not “a real-world scenario”.

Don’t do this with Find Triplets with zero-sum: skipping the failure case for Find Triplets with zero-sum. Interviewers spot it in ten seconds.

Find Triplets with zero-sum is not a lonely heading. Amit ties it to Amit walking through Find Triplets with zero-sum.

Close Find Triplets with zero-sum with: “If I skip it, Amit walking through Find Triplets with zero-sum goes wrong like this: skipping the failure case for Find Triplets with zero-sum.”

Exam tip

For Find Triplets with zero-sum: definition + lab hour + one failure.

Example

# Find Triplets with zero-sum
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)

Find Triplets with zero-sum: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefFind Triplets with zero-sum — Amit uses it for Amit walking through Find Triplets with zero-sum in lab hour.
  • RuleFind Triplets with zero-sum → one Find Triplets with zero-sum step Amit can write from memory.
  • RememberFind Triplets with zero-sum + Big-O (lab hour).
  • UseFind Triplets with zero-sum in lab hour (Amit walking through Find Triplets with zero-sum).
  • TrapFind Triplets with zero-sum — skipping the failure case for Find Triplets with zero-sum.
  • ExFind Triplets with zero-sum → Amit walking through Find Triplets with zero-sum.

Questions

1

Amit asks: why does Find Triplets with zero-sum exist? Use Amit walking through Find Triplets with zero-sum.

2

If you skip Find Triplets with zero-sum, what breaks in lab hour?

3

What trap does Amit hit with Find Triplets with zero-sum?

4

Change one input on Amit walking through Find Triplets with zero-sum. Predict the new result.

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