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DSA · Theory

Selection Sort Algorithm

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Theory

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Selection Sort Algorithm

Selection Sort Algorithm sits in the roll list. Dev’s job is names A→Z. Write that first.

For Selection Sort Algorithm, Big-O is in play. Don’t blame it until you have traced names A→Z.

Selection Sort Algorithm exists so Dev can keep names A→Z correct in the roll list.

Selection Sort Algorithm shows up in the roll list. Name names A→Z, not “a real-world scenario”.

Selection Sort Algorithm miss — unstable sort when equal keys matter. Fix it before you talk about advanced DSA.

Selection Sort Algorithm is not a lonely heading. Dev ties it to names A→Z.

Close Selection Sort Algorithm with: “If I skip it, names A→Z goes wrong like this: unstable sort when equal keys matter.”

Exam tip

For Selection Sort Algorithm: definition + the roll list + one failure.

Example

def selection_sort(arr):
    a = arr[:]
    for i in range(len(a)):
        m = i
        for j in range(i + 1, len(a)):
            if a[j] < a[m]:
                m = j
        a[i], a[m] = a[m], a[i]
    return a

print(selection_sort([5, 1, 4, 2]))

Selection Sort Algorithm — selection sort repeatedly picks the minimum of the unsorted suffix.

Short notes

  • DefSelection Sort Algorithm — Dev uses it for names A→Z in the roll list.
  • RuleSelection Sort Algorithm → n log n vs n².
  • RememberSelection Sort Algorithm + Big-O (the roll list).
  • UseSelection Sort Algorithm in the roll list (names A→Z).
  • TrapSelection Sort Algorithm — unstable sort when equal keys matter.
  • ExSelection Sort Algorithm → names A→Z.

Questions

1

Define Selection Sort Algorithm without jargon. Then point at names A→Z.

2

Name one DSA screen/job that needs Selection Sort Algorithm.

3

What trap does Dev hit with Selection Sort Algorithm?

4

Show Selection Sort Algorithm in Big-O terms — three lines max.

Previous← Insertion Sort AlgorithmNextQuick Sort Algorithm →
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