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|
#!perl
################################################################################
=comment
Perl Weekly Challenge 252
=========================
TASK #1
-------
*Special Numbers*
Submitted by: Mohammad S Anwar
You are given an array of integers, @ints.
Write a script to find the sum of the squares of all special elements of the
given array.
An element $int[i] of @ints is called special if i divides n, i.e. n % i == 0.
Where n is the length of the given array. Also the array is 1-indexed for the
task.
Example 1
Input: @ints = (1, 2, 3, 4)
Output: 21
There are exactly 3 special elements in the given array:
$ints[1] since 1 divides 4,
$ints[2] since 2 divides 4, and
$ints[4] since 4 divides 4.
Hence, the sum of the squares of all special elements of given array:
1 * 1 + 2 * 2 + 4 * 4 = 21.
Example 2
Input: @ints = (2, 7, 1, 19, 18, 3)
Output: 63
There are exactly 4 special elements in the given array:
$ints[1] since 1 divides 6,
$ints[2] since 2 divides 6,
$ints[3] since 3 divides 6, and
$ints[6] since 6 divides 6.
Hence, the sum of the squares of all special elements of given array:
2 * 2 + 7 * 7 + 1 * 1 + 3 * 3 = 63
=cut
################################################################################
#--------------------------------------#
# Copyright © 2024 PerlMonk Athanasius #
#--------------------------------------#
#===============================================================================
=comment
Interface
---------
If no command-line arguments are given, the test suite is run.
=cut
#===============================================================================
use v5.32.1; # Enables strictures
use warnings;
use Const::Fast;
use Regexp::Common qw( number );
use Test::More;
const my $USAGE => <<END;
Usage:
perl $0 [<ints> ...]
perl $0
[<ints> ...] A non-empty list of integers
END
#-------------------------------------------------------------------------------
BEGIN
#-------------------------------------------------------------------------------
{
$| = 1;
print "\nChallenge 252, Task #1: Special Numbers (Perl)\n\n";
}
#===============================================================================
MAIN:
#===============================================================================
{
if (scalar @ARGV == 0)
{
run_tests();
}
else
{
my @ints = @ARGV;
/ ^ $RE{num}{int} $ /x or error( qq["$_" is not a valid integer] )
for @ints;
printf "Input: \@ints = (%s)\n", join ', ', @ints;
printf "Output: %d\n", sum_squares_special( \@ints );
}
}
#-------------------------------------------------------------------------------
sub sum_squares_special
#-------------------------------------------------------------------------------
{
my ($ints) = @_;
my $sum = 0;
my $n = scalar @$ints;
for my $i (0 .. $#$ints)
{
$sum += $ints->[ $i ] ** 2 if $n % ($i + 1) == 0;
}
return $sum;
}
#-------------------------------------------------------------------------------
sub run_tests
#-------------------------------------------------------------------------------
{
print "Running the test suite\n";
while (my $line = <DATA>)
{
chomp $line;
my ($test_name, $ints_str, $expected) = split / \| /x, $line;
for ($test_name, $ints_str, $expected)
{
s/ ^ \s+ //x;
s/ \s+ $ //x;
}
my @ints = split / \s+ /x, $ints_str;
my $sum = sum_squares_special( \@ints );
is $sum, $expected, $test_name;
}
done_testing;
}
#-------------------------------------------------------------------------------
sub error
#-------------------------------------------------------------------------------
{
my ($message) = @_;
die "ERROR: $message\n$USAGE";
}
################################################################################
__DATA__
Example 1| 1 2 3 4 | 21
Example 2| 2 7 1 19 18 3| 63
Negatives|-1 -2 -3 -4 | 21
Singleton|42 |1764
|
