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Discussion: Efficient Sorting Algorithms

Alice Sep 14, 2025 at 09:12 AM

Hey everyone, I'm trying to understand the trade‑offs between quicksort and mergesort for large datasets. Which one tends to perform better in practice when memory usage is a concern?

Bob Sep 14, 2025 at 10:05 AM

Quicksort usually wins on average because it’s in‑place, but its worst‑case is O(n²). If you can guarantee a good pivot (e.g., median‑of‑three), it’s safe. Mergesort is stable and always O(n log n) but needs extra O(n) space.

Carol Sep 14, 2025 at 11:30 AM

For external sorting where data doesn’t fit in RAM, mergesort (or a variation like external merge sort) is preferred. It works well with sequential I/O.

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