my $i_cnt = () = sprintf("%b", $i) =~ /1/g;
my $u_cnt = () = sprintf("%b", $u) =~ /1/g;
Minor point: for simple counting, tr/// (the transliteration operator) is preferred over m//g because it’s more efficient; also, the syntax is cleaner:
my $i_cnt = sprintf('%b', $i) =~ tr/1//;
my $u_cnt = sprintf('%b', $u) =~ tr/1//;
Hope that’s of interest,
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