i,j,s,a[110],b[20000];
main(n){
    for(scanf("%d",&n);~scanf("%d",a+i);i++);
    a[i-1]=0;
    for(;n--;)for(j=1;a[j];j++)if(a[j-1]>a[j]){
    	b[s++]=j-1;
    	b[s++]=j;
    	a[j-1]^=a[j]^=a[j-1]^=a[j];
    }
    printf("%d\n",s/2);
    for(i=0;b[i];i+=2)printf("%d %d\n",b[i],b[i+1]);
    return 0;
}