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Re: Counting positive numbers

by Corion (Pope)
on Jun 29, 2010 at 12:48 UTC ( #847116=note: print w/replies, xml ) Need Help??

in reply to Counting positive numbers

I count your attempt at 40 chars:

#1234567890123456789012345678901234567890 perl -wle "$a=<>;($x=<>)>0?$_+=$x:0 while$a--;print

My attempt is 23 chars:

#123456789012345678901234 perl -wle "print 0+map{1..<>}2..<>"

Likely there are ways to improve on that, for example the space between print and 0 likely can be eliminated. If you use Perl 5.10 or higher, you can replace print with say, shaving off another two characters.

Update: Relaxing the condition of respecting the number of items in the first line doesn't shorten the code for me:

#123456789012345678901234 perl -wle "<>;print 0+map{1..<>}<>"

Replies are listed 'Best First'.
Re^2: Counting positive numbers
by eyepopslikeamosquito (Chancellor) on Jun 29, 2010 at 13:18 UTC

    Using ~~ inchworm secret operator saves a stroke:

    #1234567890123456789012 perl -wle "print~~map{1..<>}2..<>"
    Update: The inchworm secret operator is more clearly described here. I remember it from good old TPR0 way back in 2002. You can read all about TPR0 and the other early Perl golf tournaments by downloading Terje/mtv's excellent Book of Perl Golf.

    Relaxing the first line restriction allows 20 strokes (which can probably be further shortened):

    #12345678901234567890 perl -pe "$.>1&$_>0and$\+=$_}{"
    This time we use the }{ eskimo greeting secret operator in harness with Eugene's infamous $\ trick.

Re^2: Counting positive numbers
by ikegami (Pope) on Jun 29, 2010 at 15:46 UTC

    It's customary to include the switches in the count as a lot of code can be replaced by switches. For example, switching to say actually saves 3 chars.

    12345678901234 perl -le"print ..." perl -E"say ..." 12345678901
Re^2: Counting positive numbers
by Anonymous Monk on Jun 29, 2010 at 12:53 UTC

    oh! Thank u very much Corion for ur Quick Reply!

    Im focussed on getting a hold of this language!

    Thanx again :)

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