s[101];i,j;a['~~'][2];c;
main(n){
	for(scanf("%d",&n);j<n;)scanf("%d",s+j++);
	for(;i<n;i++)for(j=i;j--;)s[j]>s[j+1]&&(*a[c]=j,a[c++][1]=j+1,s[j+1]^=s[j]^=s[j+1]^=s[j]);
	for(printf("%d\n",c),i=0;i<c;i++)printf("%d %d\n",*a[i],a[i][1]);
	fflush(!gets(s));
}