use strict;
use warnings;

my $n = <>; chomp $n;
my $l = <>; chomp $l;
my @arr = split/ /,$l;

my @res;
for (my $i = 0; $i < @arr; $i++) {
  for (my $j = 0; $j < $i; $j++) {
    if ($arr[$i] < $arr[$j]) {
      ($arr[$i], $arr[$j]) = ($arr[$j], $arr[$i]);
      push @res, [$i, $j];
    }
  }
}

print scalar(@res) . "\n";
print(join(' ', ($_->[0], $_->[1])) . "\n") for @res;

#die 'no more kadomatsu' unless -1 == <>;