yeah thanks ashita...u r right..
reverse(stack *s){
IsEmpty(s)
return;
top = pop(s);
reverse(s);
ascending(s, top);
}
ascending(stack *s, int top){
IsEmpty(s){
push(top);
return;
}
i = pop(s);
if(i < top){
ascending(s, top);
push(i);
}
else{
ascending(s, i);
push(top);
}
}
On Sep 11, 6:34 pm, ashita dadlani <ash....@gmail.com> wrote:
> @Srinivas:
> shouldn't it be:
>
> i = pop(s);
> if(i > top){
> ascending(s, i);
> push(top);
> }
> else{
> ascending(s, top);
> push(i);
> }
>
> On Sat, Sep 11, 2010 at 6:52 PM, ashita dadlani <ash....@gmail.com> wrote:
>
> > else{
> > ascending(s, i);
> > push(top);
> > }
> > }
> > @swinivas:why have you used ascending(s,i) here?
> > On Sat, Sep 11, 2010 at 6:40 PM, Srinivas
> > <lavudyasrinivas0...@gmail.com>wrote:
>
> >> reverse(stack *s){
> >> IsEmpty(s)
> >> return;
> >> top = pop(s);
> >> reverse(s);
> >> ascending(s, top);
> >> }
> >> ascending(stack *s, int top){
> >> IsEmpty(s){
> >> push(top);
> >> return;
> >> }
> >> i = pop(s);
> >> if(i > top){
> >> ascending(s, top);
> >> push(i);
> >> }
> >> else{
> >> ascending(s, i);
> >> push(top);
> >> }
> >> }
>
> >> Please let me know if it wont work..thanks
>
> >> On Jul 18, 6:58 am, xyombie <brianbl...@gmail.com> wrote:
> >> > What about a quick sort O(log n)
>
> >> > void sort_stack(Stack *src, Stack *dst)
> >> > {
> >> > if(! src->IsEmpty() )
> >> > {
> >> > Stack smaller, larger;
> >> > int pivot = src->Pop();
>
> >> > while(! src->IsEmpty() )
> >> > {
> >> > int tmp = src->Pop();
> >> > if(tmp < pivot)
> >> > smaller->Push(tmp);
> >> > else
> >> > larger->Push(tmp);
> >> > }
>
> >> > sort_stack(smaller, dst);
> >> > dst->Push(pivot);
> >> > sort_stack(larger, dst);
> >> > }
>
> >> > }
>
> >> > On Jul 17, 9:28 am, vijay <auvija...@gmail.com> wrote:
>
> >> > > Write a C program to sort a stack in ascending order. You should not
> >> > > make any assumptions about how the stack is implemented. The following
> >> > > are the only
> >> > > functions that should be used to write this program:
> >> > > Push | Pop | Top | IsEmpty | IsFull
> >> > > The algorithm is O(N^2) and appears below.
> >> > > Do we have any other better solution which is less than O(n * n) ?
>
> >> > > void sort_stack(Stack * src, Stack * dest)
> >> > > {
> >> > > while (!src->IsEmpty())
> >> > > {
> >> > > Int tmp = src->Pop();
> >> > > while(!dest->IsEmpty() && dest->Top() > tmp)
> >> > > {
> >> > > src->Push(dest->Pop());
> >> > > }
> >> > > dest->Push(tmp);
> >> > > }
>
> >> > > }
>
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