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DSA · Theory

COUNT OF ZEROES

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Theory

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COUNT OF ZEROES

COUNT OF ZEROES is a DSA topic. In plain words you use it for a short COUNT OF ZEROES example in a short dry-run on paper. Don’t start with a slogan — start with that picture.

Smallest example: the smallest COUNT OF ZEROES example you can type. Type it, run it, and say what you see. If you can do that from memory, you know COUNT OF ZEROES.

From the example next to this theory — COUNT OF ZEROES: dry-run [4, 1, 3].

Trap — only saying “COUNT OF ZEROES” with no example. Fix that before you talk about advanced DSA.

Viva — what is COUNT OF ZEROES? Then show the smallest COUNT OF ZEROES example you can type. Then name the trap.

Exam tip

What is COUNT OF ZEROES? Show this: the smallest COUNT OF ZEROES example you can type. Trap: only saying “COUNT OF ZEROES” with no example.

Example

# COUNT OF ZEROES
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)

COUNT OF ZEROES: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefCOUNT OF ZEROES — a short COUNT OF ZEROES example in a short dry-run on paper.
  • Rulethe smallest COUNT OF ZEROES example you can type
  • Traponly saying “COUNT OF ZEROES” with no example
  • Usea short dry-run on paper

Questions

1

What is COUNT OF ZEROES?

2

Give one small example of COUNT OF ZEROES.

3

What mistake do beginners make with COUNT OF ZEROES?

4

Where do you use COUNT OF ZEROES?

544 / 810

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