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#!/usr/bin/env perl
# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
#=============================================================================
# Copyright (c) 2025, Bob Lied
#=============================================================================
# ch-2.pl Perl Weekly Challenge 328 Task 2 Good String
#=============================================================================
# You are given a string made up of lower and upper case English letters only.
# Write a script to return the good string of the given string. A string is
# called good string if it doesn’t have two adjacent same characters, one in
# upper case and other is lower case.
# Example 1 Input: $str = "WeEeekly"
# Output: "Weekly"
# We can remove either, "eE" or "Ee" to make it good.
# Example 2 Input: $str = "abBAdD"
# Output: ""
# We remove "bB" first: "aAdD". Then we remove "aA": "dD" Finally remove "dD".
# Example 3 Input: $str = "abc"
# Output: "abc"
#=============================================================================
use v5.40;
use Getopt::Long;
my $Verbose = false;
my $DoTest = false;
my $Benchmark = 0;
GetOptions("test" => \$DoTest, "verbose" => \$Verbose, "benchmark:i" => \$Benchmark);
my $logger;
{
use Log::Log4perl qw(:easy);
Log::Log4perl->easy_init({ level => ($Verbose ? $DEBUG : $INFO ),
layout => "%d{HH:mm:ss.SSS} %p{1} %m%n" });
$logger = Log::Log4perl->get_logger();
}
#=============================================================================
# Generate the regular expression "aA|Aa|bB|Bb|...|Zz"
my $ToBeRemoved = join("|", map { my $uc=uc($_); "$_$uc", "$uc$_" } 'a' .. 'z');
exit(!runTest()) if $DoTest;
exit( runBenchmark($Benchmark) ) if $Benchmark;
say enGooden($_) for @ARGV;
#=============================================================================
sub enGooden($str)
{
while ( $str =~ s/$ToBeRemoved//g ) { }
return $str;
}
sub runTest
{
use Test2::V0;
is( enGooden("WeEeekly"), "Weekly", "Example 1");
is( enGooden("abBAdD"), "", "Example 2");
is( enGooden("abc"), "abc", "Example 3");
is( enGooden("xAadBbDyCczdD"), "xyz", "upper-loeer combo");
done_testing;
}
sub runBenchmark($repeat)
{
use Benchmark qw/cmpthese/;
cmpthese($repeat, {
label => sub { },
});
}
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