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### Re: (Golf): Sieve of Eratosthenes

by MeowChow (Vicar)
 on May 19, 2001 at 20:54 UTC ( #81734=note: print w/replies, xml ) Need Help??

in reply to (Golf): Sieve of Eratosthenes

How about this at 45 (strict compliant too):
```sub sieve {
sub p{\$_[0],@_?p(grep\$_%\$_[0],@_):()}p 2..pop
}
[download]```
```   MeowChow
s aamecha.s a..a\u\$&owag.print```

Replies are listed 'Best First'.
Re: Re: (Golf): Sieve of Eratosthenes
by chipmunk (Parson) on May 19, 2001 at 21:54 UTC
I think that undef is not prime. :)

But at 47 characters I think MeowChow still won't be beat:

```sub sieve {
sub p{\$_[0],@_>1?p(grep\$_%\$_[0],@_):()}p 2..pop
}
[download]```
I had thought of that, but assumed it would slide :)

Make that 46 by the way...

```sub sieve {
sub p{\$_[0],\$#_?p(grep\$_%\$_[0],@_):()}p 2..pop
}
[download]```
```   MeowChow
s aamecha.s a..a\u\$&owag.print```
I had thought of that, but that goes into deep recursion if you call sieve(1). :)

Oh, but tilly says that you may assume \$n is above a fixed number. Pooh!

Abusing the rules for fun and profit (46 chars):
```sub sieve {
sub p{\$_[0],@_>1?p(grep\$_%\$_[0],@_):1}p 2..pop
}
[download]```
```   MeowChow
s aamecha.s a..a\u\$&owag.print```
Re (tilly) 2: (Golf): Sieve of Eratosthenes
by tilly (Archbishop) on May 19, 2001 at 21:27 UTC
Unless someone improves on this I think I know who is getting the t-shirt for the main problem. If anyone comes within 5 characters of beating my solution - HAH! How about if anyone completely trashes the best I could do..?

Of course the bonus question is still wide open...

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