http://www.perlmonks.org?node_id=813652

In case you're curious as to what my early-lead 60-stroke solution looked like, here it is:

y/DCLXVIM /4 DCLX9/,\$\=s/( )?\d/9x(\$&+!\$1)/egfor(<>)x4;print

This is quite a different algorithm from yours, I think.

I enjoyed the few days I was thinking about this challenge, but I don't have the tenacity to keep whittling away month after month like you serious golfers.

• Comment on Re: The golf course looks great, my swing feels good, I like my chances (Part I)

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Re^2: The golf course looks great, my swing feels good, I like my chances (Part I)
by eyepopslikeamosquito (Bishop) on Jul 24, 2010 at 03:13 UTC

I just noticed a very similar Roman numeral golf recently concluded at golf.shinh.org. Adjusting ySas' winning Perl solution to that game for this one produces this 58 stroker:

```s/(M)|D/4x@-x5/eg,s/C4//,\$\=y/LXVIC4/DCLXM/for(<>)x3;print
which has a similar form to robin's early-lead 60 stroker above -- though it uses a different algorithm. Both these solutions are very beautiful, very Perlish, and quite astonishing (at least to me).

I especially enjoyed ySas' ingenious use of @- above. I've never seen @- used like that in golf before and am tempted to give it a name, "ySas' device". By way of explanation, note that adding parentheses around (M) above adds one more element to the @- array when the (parenthesized) M matches. That is, the number of items in @- is used to differentiate between a matching M (two items in @-) and a matching D (one item in @-); this fits like a glove here because one and two happen to be the required multipliers.

Update: By applying ideas from ySas' solution, we can reduce Robin's original 60-stroker:

```y/DCLXVIM /4 DCLX9/,\$\=s/( )?\d/9x(\$&+!\$1)/egfor(<>)x4;print
```s/M2//,y/DCLXVIM/1MDCLX2/,\$\=s/\d/2x\$&x5/egfor(<>)x4;print