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DSA · Theory

What is Internal Sorting

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Theory

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What is Internal Sorting

Internal Sorting (what is) is a DSA idea you prove with names A→Z, not with a slogan.

Do Internal Sorting (what is) once by hand. n log n vs n². Change one input. Say the new result out loud.

Without Internal Sorting (what is), the roll list gets messy and names A→Z is hard to trust.

Internal Sorting (what is) shows up in the roll list. Name names A→Z, not “a real-world scenario”.

Internal Sorting (what is) trap — unstable sort when equal keys matter. Dev loses marks for that every viva.

Internal Sorting (what is) is not a lonely heading. Dev ties it to names A→Z.

Close Internal Sorting (what is) with: “If I skip it, names A→Z goes wrong like this: unstable sort when equal keys matter.”

Exam tip

Board: names A→Z. Dry-run Internal Sorting (what is). Name the trap: unstable sort when equal keys matter.

Example

# What is Internal Sorting
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)

What is Internal Sorting: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefInternal Sorting (what is) — Dev uses it for names A→Z in the roll list.
  • RuleInternal Sorting (what is) → n log n vs n².
  • RememberInternal Sorting (what is) + Big-O (the roll list).
  • UseInternal Sorting (what is) in the roll list (names A→Z).
  • TrapInternal Sorting (what is) — unstable sort when equal keys matter.
  • ExInternal Sorting (what is) → names A→Z.

Questions

1

Define Internal Sorting (what is) without jargon. Then point at names A→Z.

2

Where does Internal Sorting (what is) show up in the roll list?

3

How do you catch unstable sort when equal keys matter?

4

Change one input on names A→Z. Predict the new result.

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