Re: YAPC::EU::2013 reg.ru Go Perl golf contest

I gave a lightning talk about this and heard that someone (falsely rumoured to be BooK) had managed 197, so I've pared this down to 184 by using map{} as suggested by Sergei Mozhaisky.

#!perl
$_=++$/x11 .<>;map{$i=$-[0];{map{1while
s/w((?<=W.{10})|(?<=W.)|(?=.{9}W|W))/W/s;/W((?<= .{10})|(?<= .)|(?=.{9
+} | ))/s||$i=~/./+print("$& $'\n")+last}"$`W$'"while/w/g}}"$`x$'"whil
+e/ /g
[download]

#!perl
$_= ++$ / x11 . <>;
map {
  $i = $-[0];
  {  
    map {
      1 while
        s/w((?<=W.{10})|(?<=W.)|(?=.{9}W|W))/W/s;
      /W((?<= .{10})|(?<= .)|(?=.{9} | ))/s ||
        $i=~/./ +
        print("$& $'\n") + 
        last
    } "$`W$'" while/w/g
  }
} "$`x$'" while/ /g
[download]

UPDATE

Having stolen more ideas from Timur Nozadze I am now at 175

#!perl -ln0
map{$i=$-[0]+11;{map{1while
s/w((?<=W.{10})|(?<=W.)|(?=.{9}W|W))/W/s;/W((?<= .{10})|(?<= .)|(?=.{9
+} | ))/s||$i=~/./+print("$& $'")+last}"$`W$'"while/w/g}}"$`x$'"while/
+ /g
[download]

#!perl -ln0
map {
  $i=$-[0]+11;
  { 
    map {
      1 while
        s/w((?<=W.{10})|(?<=W.)|(?=.{9}W|W))/W/s;
      /W((?<= .{10})|(?<= .)|(?=.{9} | ))/s ||
        $i=~/./ +
        print("$& $'") +
        last
    } "$`W$'" while/w/g
  }
} "$`x$'" while/ /g
[download]

Comment on Re: YAPC::EU::2013 reg.ru Go Perl golf contest Select or Download Code

Replies are listed 'Best First'.
Re^2: YAPC::EU::2013 reg.ru Go Perl golf contest by Grimy (Pilgrim) on Aug 21, 2013 at 21:09 UTC
Variable-length negative look-behind can be emulated using `\K`. The two regexes are almost identical, and can be abstracted in a variable. `"@-"` is shorter than `"$-[0]"`. If using perl >= 5.14, `/./` followed by `"$& $'"` can be replaced with `s/./$& /r`. All in all, that's 30 characters easily chipped off. There’s still a lot of room for improvement—this `next` is hurting my eyes. I’ll probably look at it some more another day. #!perl -ln0 $:='(.{9}\|)\Kw\|w(?=(.{9}\|)'; map{$i="@-"+11;{map{1while s/W$:W)/W/s;/ \U$: )/s\|\|print($i=~s/./$& /r)+next}"$`W$'"while/w/g}}"$ +`x$'"while/ /g [download]	[reply] [d/l] [select]
Re^3: YAPC::EU::2013 reg.ru Go Perl golf contest by Grimy (Pilgrim) on Aug 22, 2013 at 11:44 UTC
Another 22 characters shaved off: `#!perl -ln0 $:='((?=W\|.{9}W)\|(?<=W.)\|(?<=W.{10}))';{1while s/w$:/W/s;/ $:/gs>//gs& +&print+("@-E-1"+1)=~y/./ /r;y/W/x/;s/w/W/&&redo}` [download] EDIT: Down to 109. I’m starting to like it, but we can likely get this under 100. `#!perl -ln0 $,='((?=.(.{9})?g)\|g(.{9})?\K)'until!s!$,w!g!s;$,=/$, /gs>//gs&&!map!y +!.! !>print,"@-e-1"+1;y&g& &&&redo` [download] EDIT2: While my first solution was correct, both solutions in this post have the same problem: if playing a single black stone captures multiple white groups, this move is printed multiple times. Here’s a 127 stroker that prints each move only once: #!perl -ln0 map{1while$,=s=$,w=g=s?'(g\|(?=.g\|..{9}g)\|g.{9})\K':/g/>/$, /s&&map{y!. +! !;print;redo}/x/+"@+E-1"or y&g&b&}"$`x$'"while/ /g [download]	[reply] [d/l] [select]


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