import java.util.*; public class No397{ public static void main(String[] args){ Scanner sc = new Scanner(System.in); int N = sc.nextInt(); int[] A = new int[N]; for(int i = 0; i < N; i++){ A[i] = sc.nextInt(); } int M = 0; int[][] uv = new int[N][2]; for(int i = 0; i < N; i++){ for(int j = 0; j < N - 1 - i; j++){ if(A[j] > A[j+1]){ int tmp = A[j]; A[j] = A[j+1]; A[j+1] = tmp; uv[M][0] = j; uv[M][1] = j+1; M++; } } } System.out.println(M); for(int i = 0; i < M; i++){ System.out.println(uv[i][0] + " " + uv[i][1]); } int a = sc.nextInt(); } }