I was trying to find some good questions involving Stack and which are not DFS type questions. The list of questions are as follows: http://www.spoj.com/problems/JNEXT/
STPAR
ONP
Compiler
Molecular Mass
It would be really helpful if you could also add some problems on Stack.
Thank you for your response, Maulik
Classic one
Click
Seinfeld
On Hackerrank
Basic stack related problems I found relate around bracket sequences. Here are 2 problems I encountered on codeforces. They're fairly easy to solve (especially the first one)
343B - Alternating Current
5C - Longest Regular Bracket Sequence
A nice problem on Stacks and implementation.
here is one