Well, I can make a ruleset that seems to fit:
- Always keep the first two numbers intact
- If any zeros start at position 3, remove them all.
- If you didn't do that, then if two or more zeros start after position 3, truncate them to a single 0
- If you didn't do either of the first two techniques, then remove a single 0 starting at position 3 or later entirely.
What happens if a single 0 starts at position 3? What does '35010333356' turn into?
Here's my code:
#!/usr/bin/perl
use strict;
use warnings;
use Test::More;
my %output_for
= ( '215000007801' => '21507801',
'300000324002' => '30324002',
'890000457651' => '89457651',
'210004563401' => '214563401',
'201045139158' => '20145139158', );
plan tests => scalar keys %output_for;
while ( my ($input, $correct_output) = each %output_for ) {
my $orig_input = $input;
$input = &compress_numstring( $input );
is( $input, $correct_output, "Solved '$orig_input'" );
}
sub compress_numstring {
my $starting_num = shift;
return $starting_num
unless(defined $starting_num && $starting_num =~ /^(\d{2})(\d+)/);
my( $keep, $modify ) = ($1,$2);
( $modify =~ s/^0+// ) ||
( $modify =~ s/0{2,}/0/ ) ||
( $modify =~ s/(?<!0)0([1-9]|$)/$1/ );
return $keep . $modify;
}
It passes the validation test, but it may fail further tests since the rules aren't clearly spelled out.
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