TWC332

Challenge Link

Task1

We convert each number into binary and join them with dashes:

#!/usr/bin/env perl
use strict;
use warnings;

sub binary_date{
  $_[0] =~ s/(\d+)/{sprintf "%b",$1}/rge
}

printf "%s\n",binary_date('2025-07-26');
printf "%s\n",binary_date('2000-02-02');
printf "%s\n",binary_date('2024-12-31');

Task2

We check if each letters occurred odd number of times:

#!/usr/bin/env perl
use strict;
use warnings;
use List::Util qw(all);

sub odd_letters{
  my %h;
  $h{$_}++ foreach split '',$_[0];
  all{$h{$_} & 1} keys %h
}

printf "%d\n",odd_letters('weekly');
printf "%d\n",odd_letters('perl');
printf "%d\n",odd_letters('challenge');