Selection Sort - Comparison
Comparison with Other Algorithms
Let’s see how selection sort compares to other sorting algorithms.
Selection vs Bubble Sort
**Advantages:**
• Fewer swaps (O(n) vs O(n²))
• More predictable performance
• Simpler logic
**Disadvantages:**
• Always O(n²) - no optimization
• Not stable
• Same comparisons regardless of input
**Advantages:**
• Can stop early if sorted (O(n) best case)
• Stable algorithm
• Simple to understand
**Disadvantages:**
• More swaps (O(n²) worst case)
• Slower in practice
• Less efficient
Selection vs Insertion Sort
Selection sort makes fewer swaps, but insertion sort can be faster for nearly sorted arrays.
When to Use Selection Sort
Selection sort is rarely used in production, but consider it when:
- You need minimum number of swaps
- Memory is extremely limited
- You’re learning sorting algorithms
- Dataset is very small
Better Alternatives
For production code, use:
- Quick Sort: O(n log n) average, fast in practice
- Merge Sort: O(n log n) guaranteed, stable
- Heap Sort: O(n log n) worst case, in-place
- Built-in sort: Usually optimized quicksort/mergesort
Key Takeaway
Selection sort is simple but slow. Understanding it helps you appreciate why better algorithms exist.
What’s Next?
Let’s test your understanding with practice problems and a quiz.
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