my $str="17:43:33:21:23:19:27:6";
my @aux = split /:/, $str;
my @ary = map {($aux[2*$_+1]) x $aux[2*$_]} 0 .. @aux/2-1;
UPDATE:
You can try the following code also:
my $str="17:43:33:21:23:19:27:6";
my %hash = split /:/, $str;
my $adno;
my $rand = rand 100;
my $sum = 0;
for (keys %hash) { # there is no need of sorted keys
$adno = $hash{$_};
last if ($sum += $_) > $rand;
}
print $adno;
UPDATE: sort keys eliminated in 'for'
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