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DSA · Theory

Pre-order Traversal

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Theory

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Pre-order Traversal

Amit only reaches for Pre-order Traversal when a Pre-order Traversal dry-run has to stay correct in a small live site.

Pre-order Traversal on the board: one Pre-order Traversal step Amit can write from memory. Then say what a Pre-order Traversal dry-run looks like after.

Without Pre-order Traversal, a small live site gets messy and a Pre-order Traversal dry-run is hard to trust.

Use Pre-order Traversal when a Pre-order Traversal dry-run must stay clear. If a simpler DSA step works, use that instead.

Pre-order Traversal miss — only reciting the name of Pre-order Traversal. Fix it before you talk about advanced DSA.

After Pre-order Traversal, Amit should still remember only reciting the name of Pre-order Traversal.

Close Pre-order Traversal with: “If I skip it, a Pre-order Traversal dry-run goes wrong like this: only reciting the name of Pre-order Traversal.”

Exam tip

For Pre-order Traversal: definition + a small live site + one failure.

Example

# Pre-order Traversal
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)

Pre-order Traversal: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefPre-order Traversal — Amit uses it for a Pre-order Traversal dry-run in a small live site.
  • RulePre-order Traversal → one Pre-order Traversal step Amit can write from memory.
  • RememberPre-order Traversal + time vs memory (a small live site).
  • UsePre-order Traversal in a small live site (a Pre-order Traversal dry-run).
  • TrapPre-order Traversal — only reciting the name of Pre-order Traversal.
  • ExPre-order Traversal → a Pre-order Traversal dry-run.

Questions

1

Amit asks: why does Pre-order Traversal exist? Use a Pre-order Traversal dry-run.

2

If you skip Pre-order Traversal, what breaks in a small live site?

3

Viva: one wrong answer people give for Pre-order Traversal.

4

Dry-run one Pre-order Traversal step Amit can write from memory and say the result.

Previous← Difference between Array-Based Queues and List-Based QueuesNextIn-order Traversal →
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