Hi TheYoungMonk,

The idiomatic way to count repeat values, or select unique values from an array is by using a hash.
for example

#!/usr/bin/perl -w

use strict;

my @arr=(1,3,5,2,6,3,7,4,9,2,3,5,1,7);
my %count;
$count{$_}++ for @arr;

print "$_ occured $count{$_} times\n" for sort { $count{$b} <=> $count
+{$a} || $a <=> $b}
keys %count;
my @uniq = sort keys %count;
print "\nunique values are @uniq\n"
[download]

this will produce

3 occured 3 times
1 occured 2 times
2 occured 2 times
5 occured 2 times
7 occured 2 times
4 occured 1 times
6 occured 1 times
9 occured 1 times

unique values are 1 2 3 4 5 6 7 9
[download]

hope this helps

thinker

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