Are the region numbers sequential, or discontiguous?
If sequential:
my @StatsArray;
push @{$StatsArray[$RegionNum]}, {
AR => $AR[$RegionNum],
BCR => $BCR[$RegionNum],
};
If sparse, this:
my %Stats;
push @{$Stats{$RegionNum}}, {
...
};
Then you could do this:
my @sorted = sort { $a->{AR} <=> $b->{AR} } @{ $StatsArray[$RegionNum]
+ };
...for example.
It might be that you're getting to the point where a database would scale better though. Another approach might be to just build a binary tree, maintaining nodes in sorted order. This allows for relatively inexpensive inserts and searches. But it does sound like you might need the scalability of a DB approach.
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