[Haskell-cafe] A tale of Project Euler

Andrew Coppin andrewcoppin at btinternet.com
Tue Nov 27 15:44:21 EST 2007

Andrew Coppin wrote:
> Also, I'm stuck with problem #10. (Find the sum of all primes less 
> than 1 million.) I've let the program run for well over 15 minutes, 
> and still no answer is forthcomming. It's implemented using the same 
> primes function as above, with a simple filter and sum. (The type has 
> to be changed to [Word64] to avoid overflowing the result though.) The 
> other guy claims to have a C solution that takes 12 ms. There's a hell 
> of a difference between 12 ms and over half an hour...(!) Clearly 
> something is horribly wrong here. Uh... help?

I just let it run to completion. Took 25 minutes and 15 seconds to find 
the (correct) answer. I would have preferred it to take 12 ms...

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