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#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say state postderef signatures };
my @examples = (
[ 1, 0, 2, 3, 0, 4, 5, 0 ],
[ 1, 2, 3 ],
[ 1, 2, 3, 0 ],
[ 0, 0, 1, 2 ],
[ 1, 2, 0, 3, 4 ],
);
for my $input (@examples) {
my $str = join ',', $input->@*;
my @output = duplicate_zeroes( $input->@* );
my $output = join ',', @output;
say <<"END";
Input: \@str = ($str)
Output: ($output)
END
}
sub duplicate_zeroes (@ints) {
my @output;
my $l = $#ints;
for my $i ( 0 .. $l ) {
my $n = $ints[$i];
my $o = $#output;
push @output, $n if $#output < $l;
push @output, $n if $n == 0 && $#output < $l;
}
return @output;
}
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