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#!/usr/bin/perl -s
use v5.24;
use Test2::V0;
use List::Util 'min';
use List::UtilsBy 'extract_first_by';
our ($tests, $examples);
run_tests() if $tests || $examples; # does not return
die <<EOS unless @ARGV;
usage: $0 [-examples] [-tests] [SIZE N...]
-examples
run the examples from the challenge
-tests
run some tests
SIZE
subgroup size
N...
list of numbers
EOS
### Input and Output
main: {
my $r = rearrange(@ARGV);
local $" = ',';
local $, = ',';
say $r ? map "(@$_)", @$r : -1;
}
### Implementation
sub rearrange {
my $size = shift;
my @res;
while (@_) {
push @res, [];
my $min = min @_;
for my $i ($min .. $min + $size - 1) {
push $res[-1]->@*, extract_first_by {$_ == $i} @_;
}
return if $res[-1]->@* != $size;
}
\@res;
}
### Examples and tests
sub run_tests {
SKIP: {
skip "examples" unless $examples;
is rearrange(3, 1,2,3,5,1,2,7,6,3), [[1, 2, 3], [1, 2, 3], [5, 6, 7]],
'example 1';
is rearrange(2, 1,2,3), U(), 'example 2';
is rearrange(3, 1,2,4,3,5,3), [[1, 2, 3], [3, 4, 5]], 'example 3';
is rearrange(3, 1,5,2,6,4,7), U(), 'example 4';
}
SKIP: {
skip "tests" unless $tests;
}
done_testing;
exit;
}
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