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DSA · Theory

Post-order Traversal

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Theory

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Post-order Traversal

Post-order Traversal is simple if you keep it on paper. Isha uses it for a Post-order Traversal dry-run in a first job task.

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

Skip Post-order Traversal and only reciting the name of Post-order Traversal shows up in a first job task.

Isha ships Post-order Traversal in a first job task. That is the use case worth saying.

If a Post-order Traversal dry-run breaks under Post-order Traversal, check only reciting the name of Post-order Traversal first.

Post-order Traversal is not a lonely heading. Isha ties it to a Post-order Traversal dry-run.

One breath for Post-order Traversal, then a Post-order Traversal dry-run, then only reciting the name of Post-order Traversal. Sit down.

Exam tip

For Post-order Traversal: definition + a first job task + one failure.

Example

# Post-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)

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

Short notes

  • DefPost-order Traversal — Isha uses it for a Post-order Traversal dry-run in a first job task.
  • RulePost-order Traversal → one Post-order Traversal step Isha can write from memory.
  • RememberPost-order Traversal + Big-O (a first job task).
  • UsePost-order Traversal in a first job task (a Post-order Traversal dry-run).
  • TrapPost-order Traversal — only reciting the name of Post-order Traversal.
  • ExPost-order Traversal → a Post-order Traversal dry-run.

Questions

1

Isha asks: why does Post-order Traversal exist? Use a Post-order Traversal dry-run.

2

Name one DSA screen/job that needs Post-order Traversal.

3

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

4

Show Post-order Traversal in Big-O terms — three lines max.

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