use strict;
use warnings;

my @strings = qw/
   111011001010011110100010100001
   111010000010010110000010000001
   000101011100001000110101110000
   000101111101001001111101111110
   111011001010111110100010100001
   000100010100000000010001010000
/;

s/(?<=.)/\0/g for my @strings1 = @strings;  # "abc" => "a\0b\0c\0"
s/(?=.)/\0/g  for my @strings2 = @strings;  # "abc" => "\0a\0b\0c"

for my $i (0..$#strings) {
   for my $j ($i+1..$#strings) {
      my %c;
      ++$c{$_} for ($strings1[$i] | $strings2[$j]) =~ /../g;
      print(join("\t", $i, $j, $c{'00'}||0, $c{'01'}||0, $c{'10'}||0, 
+$c{'11'}||0), "\n");
   }
}

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In reply to Re: Speeding permutation counting by ikegami
in thread Speeding permutation counting by albert

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