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DSA · Theory

Maximum profit by buying and selling a share at most twice

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Theory

388/810

Maximum profit by buying and selling a share at most twice

Maximum profit by buying and selling a share at most twice is a DSA topic. In plain words you use it for a short Maximum profit by buying and selling a share at most twice example in a short dry-run on paper. Don’t start with a slogan — start with that picture.

Smallest example: the smallest Maximum profit by buying and selling a share at most twice example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Maximum profit by buying and selling a share at most twice.

From the example next to this theory — Maximum profit by buying and selling a share at most twice: dry-run [4, 1, 3].

Trap: only saying “Maximum profit by buying and selling a share at most twice” with no example. Fix that before you talk about advanced DSA.

Viva: what is Maximum profit by buying and selling a share at most twice? Then show the smallest Maximum profit by buying and selling a share at most twice example you can type. Then name the trap.

Exam tip

What is Maximum profit by buying and selling a share at most twice? Show this: the smallest Maximum profit by buying and selling a share at most twice example you can type. Trap: only saying “Maximum profit by buying and selling a share at most twice” with no example.

Example

# Maximum profit by buying and selling a share at most twice
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)

Maximum profit by buying and selling a share at most twice: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefMaximum profit by buying and selling a share at most twice — a short Maximum profit by buying and selling a share at most twice example in a short dry-run on paper.
  • Rulethe smallest Maximum profit by buying and selling a share at most twice example you can type
  • Traponly saying “Maximum profit by buying and selling a share at most twice” with no example
  • Usea short dry-run on paper

Questions

1

What is Maximum profit by buying and selling a share at most twice?

2

Give one small example of Maximum profit by buying and selling a share at most twice.

3

What mistake do beginners make with Maximum profit by buying and selling a share at most twice?

4

Where do you use Maximum profit by buying and selling a share at most twice?

388 / 810

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