Hi All,

Somone posted what seemed like a homework question here. I replied in a golfish format, and mentioned the fact to the CB. Chemboy suggested posting it as a real golf, wherupon CheeseLord stepped in and said that in a similer reply, which also called for Golf, tachyon had provided an even better answer than mine.

Seemed like an interesting problem, so I present the Nth annual rangify function golf contest!

Problem
Given an unsorted list of unique positive integers convert this list into a "rangeified" form, where all consequtive sequences of numbers are coded into a BEGIN-END format.

For instance, the list 1089,3,4,0,5,6,7,99,832,1087,831,1088
would become 0,3-7,99,831-832,1087-1089

In order to keep it interesting answers in three catagories will be allowed, also code _must_ be strict safe.

  1. Returns a stringified version of the list
  2. Returns a list
  3. Does *not* use map()
So to start things off I present my solution, rather big I must say at 105 chars, for catagories 1 and 3 as the following code: 
#           1         2         3         4         5         6
# 01234567890123456789012345678901234567890123456789012345678901234567
+890
sub demerphq{
  @0=sort{$a<=>$b}@_;$_=":@0";1 while s/:((\d+)(-(\d+))?) (\d+)/
  $5-$2-1&&$5-$4-1?"$1,:$5":":$2-$5"/e;y/://d;$_
}

[download]
Thanks and apologies (for mispelling his name) to CheeseLord for a couple of tips. But from what I've heard it wont help me much....

:-)

Yves
--
You are not ready to use symrefs unless you already know why they are bad. -- tadmc (CLPM)

In reply to (Golf) Rangify Array by demerphq

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