How to resolve the algorithm Range extraction step by step in the Perl programming language

Published on 12 May 2024 09:40 PM
#Perl

How to resolve the algorithm Range extraction step by step in the Perl programming language

Table of Contents

Problem Statement

A format for expressing an ordered list of integers is to use a comma separated list of either Example The list of integers: Is accurately expressed by the range expression: (And vice-versa).

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Range extraction step by step in the Perl programming language

Source code in the perl programming language

sub rangext {
    my $str = join ' ', @_;
    1 while $str =~ s{([+-]?\d+) ([+-]?\d+)}
        {$1.(abs($2 - $1) == 1 ? '~' : ',').$2}eg; # abs for neg ranges
    $str =~ s/(\d+)~(?:[+-]?\d+~)+([+-]?\d+)/$1-$2/g;
    $str =~ tr/~/,/;
    return $str;
}

# Test and display
my @test = qw(0  1  2  4  6  7  8 11 12 14
             15 16 17 18 19 20 21 22 23 24
             25 27 28 29 30 31 32 33 35 36
             37 38 39);
print rangext(@test), "\n";


use Set::IntSpan;
sub rangext { return Set::IntSpan->new(@_) . '' }  # stringized


use Set::IntSpan::Fast;
sub rangext { return Set::IntSpan::Fast->new(@_)->as_string }

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