Programmer Humor

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Returns a sorted list in O(1) time (programming.dev)

submitted 10 months ago by [email protected] to c/[email protected]

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[–] [email protected] 36 points 10 months ago* (last edited 10 months ago) (3 children)

What your code can do is run this first and if it returns false then do a quick double check using a traditional isPrime function. Really speeds things up!

[–] [email protected] 25 points 10 months ago (1 children)

I mean, it has a 99.999%+ success rate on a large enough sample and I can live with that.

[–] [email protected] 6 points 10 months ago

Nah, you've always got to check the corner cases. It's a variation on Murphy's Law - you don't encounter corner cases when you're developing a program but corner cases are 99 percent of an everyday user's interaction.

[–] [email protected] 5 points 10 months ago (1 children)

Good idea, but it would be much faster if you do the double-check on true instead.

[–] xmunk 1 points 10 months ago

This is a power(ful) idea.

Are my stats/programmers in the house?

[–] fibojoly 4 points 10 months ago

Better. Return true if the number is in a stored list of known primes, otherwise return false right away. But then, start a separate thread with an actual verification algorithm. When the verification is done, if it was actually a prime number, you just crash the program with a WasActuallyPrime exception.