Hi,

I'm in a need for some assistance. The thing is, I would need to write a counter that works in the same way as this one: 

my %hash;
my @array = qw(1 3 4 55 4 3 4 22 1 3 4 3 2 2 3 34);

foreach (@array){
  $hash{$_}++;
}

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and figure out which of the numbers in the array appear only one time, but i cannot use the built-in hash data structure.
so the result that i'm expecting would be 
55,22,34 are the numbers that appear only once

[download]
Oh, yes and i have to stick to only basic conditionals and iterators, meaning no greping or mapping. however sorting is allowed. I was thinking of just sreating an array and then using indexes as hash keys but then a lot of positions would not be initialized(using space for nothing) and I would need to make 55 instead of 16 steps to get to my result.

Can anyone make a creative suggestion on how to do this in more effective and economic way ?

Thank you

baxy

In reply to How to hash without the hash- basic by baxy77bax

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