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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-1.pl Perl Weekly Challenge 337 Task 1 Smaller Than Current
#=============================================================================
# You are given an array of numbers, @num1. Write a script to return an
# array, @num2, where $num2[i] is the count of all numbers less than or
# equal to $num1[i].
# Example 1 Input: @num1 = (6, 5, 4, 8)
# Output: (2, 1, 0, 3)
# index 0: numbers <= 6 are 5, 4 => 2
# index 1: numbers <= 5 are 4 => 1
# index 2: numbers <= 4, none => 0
# index 3: numbers <= 8 are 6, 5, 4 => 3
# Example 2 Input: @num1 = (7, 7, 7, 7)
# Output: (3, 3, 3, 3)
# Example 3 Input: @num1 = (5, 4, 3, 2, 1)
# Output: (4, 3, 2, 1, 0)
# Example 4 Input: @num1 = (-1, 0, 3, -2, 1)
# Output: (1, 2, 4, 0, 3)
# Example 5 Input: @num1 = (0, 1, 1, 2, 0)
# Output: (1, 3, 3, 4, 1)
#=============================================================================
use v5.42;
use Getopt::Long;
my $Verbose = false;
my $DoTest = false;
GetOptions("test" => \$DoTest, "verbose" => \$Verbose);
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;
say "(", join(", ", stc(@ARGV)->@*), ")";
#=============================================================================
sub stc(@int)
{
my @sorted = sort { $a <=> $b } @int;
my %smaller;
for my ($i, $n) ( indexed @sorted )
{
$smaller{$n} = $i;
}
return [ @smaller{@int} ];
}
sub runTest
{
use Test2::V0;
is( stc(6,5,4,8), [2,1,0,3], "Example 1");
is( stc(7,7,7,7), [3,3,3,3], "Example 2");
is( stc(5,4,3,2,1), [4,3,2,1,0], "Example 3");
is( stc(-1,0,3,-2,1), [1,2,4,0,3], "Example 4");
is( stc(0,1,1,2,0), [1,3,3,4,1], "Example 5");
is( stc(), [], "Empty list");
is( stc(9), [0], "Singleton list");
done_testing;
}
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