I'm not convinced I like any of the above when it comes to readability. Here is what I came up with that might make it easier for a junior-level programmer to at least have half a clue as to what is going on (it being understood that my choice of variable names could be better):
my $id = shift or return q();
# my $chunk_length = length $id > 6 ? 3 : 2;
my $chunk_length = $id < 1e6 ? 2 : 3;
my $path_pat = '%0' . $chunk_length . 'd';
$path_pat = join('/', $path_pat, $path_pat, $path_pat);
my $chunk_power = 10 ** $chunk_length;
my $path = sprintf $path_pat, $id / ($chunk_power ** 2),
($id / $chunk_power) % $chunk_power, $id % $chunk_power;
FWIW, it passes all 23 tests.
Update: Changed how $chunk_lentgh is determined. I like the numeric test better after looking at it for a while.
It helps to remember that the primary goal is to drain the swamp even when you are hip-deep in alligators.
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