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$hash{ sprintf "%050d", $_ } = 1 for 0 .. 2e6;; print total_size \%hash;; ... $hash{ sprintf "%012d", $_ } = 1 for 0 .. 2e6;; print total_size \%hash;; 67660852
$a[ $_ ] = sprintf "%050d", $_ for 0 .. 2e6;; print total_size \@a;; 30408448