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#!/usr/bin/env perl
# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
#=============================================================================
# Copyright (c) 2024, Bob Lied
#=============================================================================
# ch-2.pl Perl Weekly Challenge 260 Task 2 Dictionary Rank
#=============================================================================
# You are given a word, $word.
# Write a script to compute the dictionary rank of the given word.
# Example 1 Input: $word = 'CAT'
# Output: 3
# All possible combinations of the letters:
# CAT, CTA, ATC, TCA, ACT, TAC
# Arrange them in alphabetical order:
# ACT, ATC, CAT, CTA, TAC, TCA
# CAT is the 3rd in the list.
# Therefore the dictionary rank of CAT is 3.
#
# Example 2 Input: $word = 'GOOGLE'
# Output: 88
# Example 3 Input: $word = 'SECRET'
# Output: 255
#=============================================================================
use v5.38;
use builtin qw/true false/; no warnings "experimental::builtin";
use Getopt::Long;
my $Verbose = 0;
my $DoTest = 0;
GetOptions("test" => \$DoTest, "verbose" => \$Verbose);
exit(!runTest()) if $DoTest;
say dictOrder($_) for @ARGV;
sub dictOrder($word)
{
use List::Permutor;
my $perm = List::Permutor->new( sort { $a cmp $b } split(//, $word) );
my $place = 0;
my %seen; # Skip duplicate letters
while ( my $p = join("", $perm->next()) )
{
next if $seen{$p};
$place++;
say "$place $p" if $Verbose;
last if $p eq $word;
$seen{$p} = true;
}
return $place;
}
sub runTest
{
use Test2::V0;
is( dictOrder("CAT"), 3, "Example 1");
is( dictOrder("GOOGLE"), 88, "Example 2");
is( dictOrder("SECRET"), 255, "Example 3");
done_testing;
}
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