You need to choose y-1 divisions in your set of objects.

For your example, that would be: 

for my $p0 (1     .. 5-1) {
for my $p1 ($p0+1 .. 5-1) {
    print(
        substr('12345', 0, $p0),
        "|",
        substr('12345', $p0, $p1-$p0),
        "|",
        substr('12345', $p1, 5-$p1),
        "\n",
    );
}}

[download]

The general case requires y-1 nested loops. When you have a variable number of nested loop, Algorithm::Loops's NestedLoops is great: 

use Algorithm::Loops qw( NestedLoops );

my $num_objects    = 5;
my $num_containers = 3;

my $str = join('', 1..$num_objects);

NestedLoops(
    [
        [ 1 .. $num_objects-1 ],
        (sub { [ $_[-1]+1 .. $num_objects-1 ] }) x ($num_containers-2)
    ],
    sub {
        my $str = $str;
        substr($str, $_, 0, '|') for reverse @_;
        print("$str\n");
    },
);

[download]
1|2|345
1|23|45
1|234|5
12|3|45
12|34|5
123|4|5

[download]

In reply to Re: x objects in y containers where all objects are used by ikegami
in thread x objects in y containers where all objects are used by Ectaris

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.