Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

Re: (Golf) Reversing RPN Notation

by bobione (Pilgrim)
on May 22, 2001 at 16:58 UTC ( #82213=note: print w/ replies, xml ) Need Help??


in reply to (Golf) Reversing RPN Notation

Well, I made my better but it is not enough. I am happy to solve a part of this problem. Here my small contribution :
(I use special variable $, $/ and $; to minimize declaration)

sub LTR { # 116 characters my@a;for(@_){if(/\d/){push@a,$_}else{$/=pop@a; $,=join' ',pop@a,$_,$/;$,=~s/(.*)/($1)/ if((/[+-]/);push@a,$,;$;=$ +_}}@a } print LTR qw(1 2 - 3 4 + 5 * /);

My solution don't really minimize brackets :( (but seems to be correct most of the time; more brackets are better than less :))

Another problem is that I don't use %operator because it wasn't really helpful (without last change). So It can't solve Update #2 from Masem (I only see it now).

This problem is very tricky... When should we use brackets or not ???
Congratulation to chipmunk and MeowChow for their contributions.

BobiOne KenoBi ;)


Comment on Re: (Golf) Reversing RPN Notation
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://82213]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others contemplating the Monastery: (6)
As of 2015-07-05 04:27 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (60 votes), past polls