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DSA · Theory

b)LR Rotation

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Theory

94/810

b)LR Rotation

b)LR Rotation is a DSA topic. In plain words you use it for a short bLR Rotation example in a short dry-run on paper. Don’t start with a slogan — start with that picture.

Smallest example: the smallest bLR Rotation example you can type. Type it, run it, and say what you see. If you can do that from memory, you know b)LR Rotation.

From the example next to this theory — b)LR Rotation: dry-run [4, 1, 3].

Trap — only saying “bLR Rotation” with no example. Fix that before you talk about advanced DSA.

Viva — what is b)LR Rotation? Then show the smallest bLR Rotation example you can type. Then name the trap.

Exam tip

What is b)LR Rotation? Show this: the smallest bLR Rotation example you can type. Trap: only saying “bLR Rotation” with no example.

Example

# b)LR Rotation
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)

b)LR Rotation: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • Defb)LR Rotation — a short bLR Rotation example in a short dry-run on paper.
  • Rulethe smallest bLR Rotation example you can type
  • Traponly saying “bLR Rotation” with no example
  • Usea short dry-run on paper

Questions

1

What is b)LR Rotation?

2

Give one small example of b)LR Rotation.

3

What mistake do beginners make with b)LR Rotation?

4

Where do you use b)LR Rotation?

94 / 810

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