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DSA · Theory

Majority Element

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Theory

386/810

Majority Element

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

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

From the example next to this theory — Majority Element: dry-run [4, 1, 3].

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

Viva — what is Majority Element? Then show the smallest Majority Element example you can type. Then name the trap.

Exam tip

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

Example

# Majority Element
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)

Majority Element: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefMajority Element — a short Majority Element example in a short dry-run on paper.
  • Rulethe smallest Majority Element example you can type
  • Traponly saying “Majority Element” with no example
  • Usea short dry-run on paper

Questions

1

What is Majority Element?

2

Give one small example of Majority Element.

3

What mistake do beginners make with Majority Element?

4

Where do you use Majority Element?

386 / 810

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