As already said in chat congratulation Athanasius for your Boustrophedon distribution function.I thought your crucial line was difficult to read and my hubris lead me think i could semplify it by playing with the index of @A..

..as always i endend with a hyper complicated and cryptic solution, even if my hubrys is partially satisfied: anyway TIMTOWTDI!!

#! perl
use strict;
use warnings;
use Data::Dump;



my @A = qw ( H1 H2 H3 H4);         # original set
my @B = qw (1 2 3 4 5 6 7 8 9 10); # as per OP

my %h;

my $i = 0;
while (@B) {

    push @{$h{$A[$i]}},shift @B;
    $i == $#A ? $i = -1 : $i == -$#A-1 ? $i = 0 :  $i < 0 ? $i-- : $i+
++;
}
dd %h;
[download]

L*

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