s[101];a[101];b[101];f;t;i;
c(int*g,int*h){s[*g]-s[*h]>0?f?printf("%d %d\n",g-b,h-b):++t:0;return s[*g]-s[*h];}
main(n){
	for(scanf("%d",&n);i<n;a[i]=b[i]=i,i++)scanf("%d",s+i);
	f=printf("%d\n",t,qsort(a,n,4,c));qsort(b,n,4,c);
	fflush(scanf("%*d"));
}