forked from manwar/perlweeklychallenge-club
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ch-2.pl
executable file
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ch-2.pl
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#!/usr/bin/perl
use 5.030;
use warnings;
sub invalid {
say -i;
exit;
}
my $size = shift;
my @list = @ARGV;
unless (scalar @list % $size == 0) {
invalid;
}
my %frequency;
for my $i (@list) {
$frequency{$i}++;
}
my @numbers = sort { $a <=> $b } keys %frequency;
my @results;
my $length = scalar @list / $size;
for (1 .. $length) {
my @group;
my $start = 0;
for my $i (@numbers) {
if ($frequency{$i} > 0) {
$start = $i;
last;
}
}
if (!$start) {
invalid;
}
for my $i ($start .. $start + $size - 1) {
if (!exists $frequency{$i} || $frequency{$i} == 0) {
invalid;
}
push @group, $i;
$frequency{$i}--;
}
push @results, \@group;
}
say join q{, }, map { q{(} . ( join q{, }, @{$_} ) . q{)} } @results;