Multi-key sort, both in descending order:
>perl -wMstrict -le
"use List::Util qw(sum);
;;
my $scan = {
a => [ 5, 6 ], b => [ 5, 10, 15 ], c => [ 100 ], d => [ 8, 9 ]
};
;;
my @sorted =
map $_->[0],
sort { $b->[1] <=> $a->[1] or $b->[2] <=> $a->[2] }
map [ $_, scalar @{ $scan->{$_} }, sum @{ $scan->{$_} } ],
keys %$scan
;
;;
print qq{@sorted};
"
b d a c
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