Nice solution. There is room for improvement, though.
No need for return, use that for filtering out empty items:
sub c {($a,$c)=@_;@c=@$c;grep$_,map{$a>$_?
&{sub{$a-=$_*($b=int($a/$_));"$b x $_"}}:""} reverse @c}
Char-neutral, but leaving the grep out gains 7 chars.
You don't need the parens after the int, and leave out the
spaces around the reverse. Gains you 4 char:
sub c{($a,$c)=@_;@c=@$c;grep$_,map{$a>$_?
&{sub{$a-=$_*($b=int$a/$_);"$b x $_"}}:""}reverse@c}
Jeroen
"We are not alone"(FZ)
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