/* Idea is the use pointer arithmetics */
Element* reverse(Element *first){
int diff1, diff2;
if(!first || !(first->next))
return first;
diff1 = first - (Element *) NULL;
diff2 = first->next - first;
while(first+diff2){
first->next = first - diff1;
first = first + diff2;
diff1 = diff2;
diff2 = first->next - first;
}
first->next = first-diff1;
return first;
}