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#!/usr/bin/perl
#
# Perl Weekly Challenge - 069
#
# Task #1: Strobogrammatic Number
#
# https://perlweeklychallenge.org/blog/perl-weekly-challenge-069
#
use strict;
use warnings;
my $A = $ARGV[0] || 50;
my $B = $ARGV[1] || 100;
print sprintf("[%s]\n", join ', ', strobogrammatic_numbers($A, $B));
sub strobogrammatic_numbers {
my ($start, $stop) = @_;
die "ERROR: Missing start number.\n"
unless defined $start;
die "ERROR: Missing stop number.\n"
unless defined $stop;
die "ERROR: Invalid start number [$start].\n"
unless ($start >= 1);
die "ERROR: Invalid end number [$stop].\n"
unless ($stop >= 1);
die "ERROR: Invalid start number [$start].\n"
unless ($start < $stop);
my %digits = (6 => 9, 8 => 8, 9 => 6);
my @strobogrammatic = ();
foreach my $n ($start .. $stop) {
next if ($n < 10);
my $found = 1;
my @match = ();
foreach my $i (split //, $n) {
if (exists $digits{$i}) {
push @match, $digits{$i};
}
else {
$found = 0;
last;
}
}
if ($found) {
push @strobogrammatic, $n
if ($n == join('', reverse @match));
}
}
return @strobogrammatic;
}
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