fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let mut a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let mut result: Vec<(usize, usize)> = vec![];
    for i in 0..n {
        for j in i..n {
            if a[i] > a[j] {
                a.swap(i, j);
                result.push((i, j));
            }
        }
    }
    println!("{}", result.len());
    result.iter().for_each(|pair| println!("{} {}", pair.0, pair.1));

    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
}