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Marge Sort (mander.xyz)

submitted 2 weeks ago by [email protected] to c/[email protected]

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[–] Eheran 40 points 2 weeks ago (11 children)

How does the last step sort an of the sizes? Why even have all the other steps if that one can do it all?

[–] SmoothLiquidation 31 points 2 weeks ago (1 children)

When you merge two sorted lists, you only have to compare the first element of each, since you can trust that all of the other elements are bigger. All the steps before that are there to make sure that is true.

[–] [email protected] 14 points 2 weeks ago (2 children)

Wait, how do I know that all four of the right half aren't smaller than all four of the Left half?

[–] [email protected] 27 points 2 weeks ago

You don't, and they can be.

Watch the animation on Wikipedia: https://en.wikipedia.org/wiki/Merge_sort

[–] SmoothLiquidation 11 points 2 weeks ago

It doesn’t matter. You check the first of each group and pick the smallest, then compare the one you didn’t pick with the next one of the other group. In your example, you would pick all of the ones from the right side and once it is empty, just add all the ones on the left.

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