Beginner Topic 9 of 51 Algorithms
Selection Sort
Repeatedly selecting the minimum from the unsorted part.
How it works
Each pass finds the minimum of the unsorted portion and swaps it into place. It always does O(n²) comparisons but only O(n) swaps.
Where it is used
When writes are expensive, such as flash memory.
Common pitfall
Not stable by default, and no best-case speedup on sorted input.
Where it fits in the course
Selection Sort is topic 9 of 51 in Algorithms, rated Beginner. It follows Bubble Sort. The next topic is Insertion Sort.
Practice and explore
- Open the interactive lesson, with a mini quiz.
- Take the Algorithms quiz.
- Explore the Sorting Algorithms visualizer: Bubble, selection, insertion, merge and quick sort animated.
How to study this topic
- Read the explanation above and restate the definition in your own words.
- Open the interactive lesson and answer its mini quiz.
- Read the common pitfall, then write a short example that avoids it.
- Check your understanding in the Algorithms quiz, and revisit the topic if you miss a question.
Frequently asked questions
What is Selection Sort?
Repeatedly selecting the minimum from the unsorted part. It belongs to Algorithms and is a beginner-level topic.
Where do people use Selection Sort?
When writes are expensive, such as flash memory.
What is the most common mistake with Selection Sort?
Not stable by default, and no best-case speedup on sorted input.
What should I learn before this topic?
Start with Bubble Sort, the topic just before it in Algorithms.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Algorithms quiz. You can also explore Sorting Algorithms in the Visual Lab.
Is Selection Sort hard to learn?
It is a Beginner topic, so it works as an entry point. If the terms are new, read the explanation twice and try the visualizer before the quiz.
How long does it take to learn Selection Sort?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Selection Sort?
Bubble Sort, Insertion Sort, Binary Search are closely connected. The full list is in the related topics section of this page.
What should I study after Selection Sort?
Continue with Insertion Sort, the next topic in Algorithms.
Related topics
- Bubble Sort (Algorithms)
- Insertion Sort (Algorithms)
- Binary Search (Algorithms)
- Merge Sort (Algorithms)