[Beowulf] A start in Parallel Programming?
landman at scalableinformatics.com
Tue Mar 20 09:59:18 EDT 2007
Robert G. Brown wrote:
> On Mon, 19 Mar 2007, Joe Landman wrote:
>> ps disclosure: FWIW I do play the occasional Perl golf. Last one I
>> played with was to write a roman numeral calculator (c.f.
>> http://www.fonality.com/golf/ and
> Just for grins I did this too (and thanks for nothing -- gawds, all I
> need is another mindless programming task:-)
Heh... Well last I checked I was #53 or so on there. 350 characters for
a roman numeral calculator. After it was over, I learned how to shave
20-30 characters off.
Not that this is a useful skill or anything like that, but it was a
Sort of like Sudoku. Or the chess Queens problem.
> The only problem I have with it is the "least number of keystrokes"
> thing. I personally think that this part at the very least needs to be
> "in the active subroutine, exclusive of debugging code" to eliminate the
> trivial overhead of getting the number in from the command line or
> whereever and various good-practice things like comments, indentation,
Actually I think minimal number of keystrokes is not necessarily the
right way to do things. Having programmed in APL ages ago, I can tell
you that some abstractions are better left untouched ...
> The other problem I have with the challenge is that a) the test strings
> are all trivial and are far from exhaustive of the available test space;
This is curiously what separates the approaches. The most common short
approach is to avoid doing conversions, but to run a loop over the
indices 1 to 3999 and generate roman numerals from that. Then when
there is a match, use that in the calculation. Saves having to do a
forward/backwards conversion. Wasteful on memory/time. But sure saves
on keystrokes. Also, I cannot for the life of me mentally parse some of
> b) the routine doesn't have to REJECT strings that are technically
> invalid (or at least odd) since the "roman numeral algorithm" isn't
> single valued without additional restriction. For example,
> XLII = 42 = VIIIL = XXXXII?
> (Note well that the answer in all cases, curiously enough, is "42",
Yeah ... but whats the question ...
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: landman at scalableinformatics.com
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