#include <bits/stdc++.h>

//const static double	de_PI	= 3.14159265358979323846;
//const static int	de_MOD	= 1000000007;
//const static int	de_MAX	= 999999999;
//const static int	de_MIN = -999999999;

int main(void) {

	//std::ifstream inf("123.txt");	std::cin.rdbuf(inf.rdbuf());

	int N = 0, M = 0;
	std::cin >> N;
	std::vector<int> A(N),B;
	for (int i = 0; i < N; i++) { std::cin >> A[i]; }

	int st = 0, ed = N - 1, next = 0;
	while(1) {

		next = st;
		for (int i = st; i < ed; i++) {
			if (A[i] > A[i + 1]) {
				M++;
				B.push_back(i);
				B.push_back(i + 1);
				std::swap(A[i], A[i + 1]);
				next = i;
			}
		}

		ed = next;
		if (st == ed) { break; }

		next = ed;
		for (int i = ed; i > st; i--) {
			if (A[i] < A[i - 1]) {
				M++;
				B.push_back(i - 1);
				B.push_back(i);
				std::swap(A[i], A[i - 1]);
				next = i;
			}
		}

		st = next;
		if (st == ed) { break; }
	}

	std::cout << M << std::endl;
	for (unsigned int i = 0; i < B.size(); i += 2) {
		std::cout << B[i] << " " << B[i + 1] << std::endl;
	}

	std::cin >> N;

}