#include <bits/stdc++.h>
#define int long long
using namespace std;
int a[320001], aa[320001],bb[20001], ans, n, now;
int read()
{
    int x = 0, f = 1;
    char ch = getchar();
    while (ch < '0' || ch > '9')
    {
        if (ch == '-')
            f = -1;
        ch = getchar();
    }
    while (ch >= '0' && ch <= '9')
    {
        x = (x << 1) + (x << 3) + (ch ^ 48);
        ch = getchar();
    }
    return x * f;
}
signed main()
{
    n = read();
    for (int i = 1; i <= n; i++)
    {
        a[i] = read();
    }
    for (int i = 1; i <= n; i++)
    {
        now = i;
        for (int j = i + 1; j <= n; j++)
        {
            if (a[now] > a[j])
                now = j;
        }
        if (now != i)
        {
            reverse(a + i, a + now + 1);
            ans++;
            aa[ans] = i;
            bb[ans] = now;
        }
    }
    printf("%lld\n", ans);
    for (int i = 1; i <= ans; i++)
    {
        printf("%lld %lld\n", aa[i], bb[i]);
    }
    return 0;
}