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You'd pass in your destination node instead of desired length, and your first test would be whether you're starting at your destination. So:
sub find_path { my ($start_at, $end_at, $been_there) = (@_, {}); if ($start_at == $end_at) { return [$start_at]; } else { my @try_these = grep { ! $been_there->{$_} } @{$adjacency_list{$st +art_at}}; return map { my @cdr_list = find_path($_, $end_at, {%$been_there, $start_at = +> 1}); map [$start_at, @$_], @cdr_list; } @try_these; } }
Homework?

Caution: Contents may have been coded under pressure.

In reply to Re^3: find all paths of length n in a graph by Roy Johnson
in thread find all paths of length n in a graph by davidj

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