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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 331 Task 2 Buddy Strings
#=============================================================================
# You are given two strings, source and target.
# Write a script to find out if the given strings are Buddy Strings.
# If swapping of a letter in one string make them same as the other
# then they are `Buddy Strings`.
# Example 1 Input: $source = "fuck" $target = "fcuk"
# Output: true
# The swapping of 'u' with 'c' makes it buddy strings.
#
# Example 2 Input: $source = "love" $target = "love"
# Output: false
# Example 3 Input: $source = "fodo" $target = "food"
# Output: true
# Example 4 Input: $source = "feed" $target = "feed"
# Output: true
#=============================================================================
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();
}
#=============================================================================
exit(!runTest()) if $DoTest;
exit( runBenchmark($Benchmark) ) if $Benchmark;
for my ($src, $targ) ( @ARGV )
{
say (isBuddy($src, $targ) ? "true" : "false");
}
#=============================================================================
sub isBuddy($source, $target)
{
return false if length($source) != length($target);
my @s = split(//, $source);
my @t = split(//, $target);
for my $i ( 0 .. $#s - 1 )
{
for my $j ( $i+1 .. $#s )
{
if ( $s[$i] eq $t[$j] && $s[$j] eq $t[$i] )
{
# We have a swappable pair. Do the rest of the
# strings match?
my @src = @s;
( $src[$i], $src[$j] ) = ( $t[$i], $t[$j] );
return true if "@src" eq "@t";
}
}
}
return false;
}
sub runTest
{
use Test2::V0;
is( isBuddy("fuck", "fcuk"), true, "Example 1");
is( isBuddy("love", "love"), false, "Example 2");
is( isBuddy("fodo", "food"), true, "Example 3");
is( isBuddy("feed", "feed"), true, "Example 4");
is( isBuddy("hamster", "ramsteh"), true, "Non-consecutive pair");
is( isBuddy("short", "srohter"), false, "Different lengths");
is( isBuddy("bcxxxb", "cbxxxb"), true, "Multiple possible pairs");
done_testing;
}
sub runBenchmark($repeat)
{
use Benchmark qw/cmpthese/;
cmpthese($repeat, {
label => sub { },
});
}
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