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#!/usr/bin/perl
use v5.26;
use Test2::V0 -no_srand;
use Test2::Tools::Subtest 'subtest_streamed';
use Getopt::Long;
use experimental 'signatures';
### Options and Arguments
my ($tests, $examples, $verbose);
GetOptions(
'examples!' => \$examples,
'tests!' => \$tests,
'verbose!' => \$verbose,
) or usage();
run_tests($examples, $tests); # tests do not return
usage() unless @ARGV;
sub usage {
die <<~EOS;
$0 - duplicate removals
usage: $0 [-examples] [-tests] [STR]
-examples
run the examples from the challenge
-tests
run some tests
STR
a string
EOS
}
### Input and Output
say duplicate_removals(shift);
### Implementation
#
# For details see:
# https://github.sommrey.de/the-bears-den/2025/10/17/ch-340.html#task-1
sub duplicate_removals ($str) {
1 while $str =~ s/(.)\1//;
$str;
}
### Examples and Tests
sub run_tests ($examples, $tests) {
return unless $examples || $tests;
state sub run_example ($args, $expected, $name) {
my $result = duplicate_removals(@$args);
is $result, $expected,
"$name: (@$args) -> $expected";
}
plan 2;
$examples ? subtest_streamed(examples => sub {
my @examples = (
[['abbaca'], 'ca', 'example 1'],
[['azxxzy'], 'ay', 'example 2'],
[['aaaaaaaa'], '', 'example 3'],
[['aabccba'], 'a', 'example 4'],
[['abcddcba'], '', 'example 5'],
);
plan scalar @examples;
for (@examples) {
run_example @$_;
}
}) : pass 'skip examples';
$tests ? subtest_streamed(tests => sub {
plan 1;
pass 'no tests';
}) : pass 'skip tests';
exit;
}
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