#include <iostream>
#include <cstdlib>
#include <cstring>
#include <algorithm>
 
using namespace std;
 
#define next next_
 
int a[20000];
int aa[20000];
int bb[20000];
 
int main(){
    int Q = 0;
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
    }
    
    for (int i = 1; i <= n; i++){
        int num = i;
        for (int j = i + 1; j <= n; j++){
            if (a[num] > a[j]) num = j;
        }
        
        if (num != i){
                reverse(a + i, a + num + 1);
                Q++;
                aa[Q] = i;
                bb[Q] = num;
        }
    }
    cout << Q << endl;
    for (int i = 1; i <= Q; i++) cout << aa[i] << " " << bb[i] << endl;
    return 0;
}