Please follow the below instructions while posting any problem.
1. Use appropriate titles like "element find in sorted array" "element
uniqueness". Do not use titles like "interesting one", "tricky one" or
"Can you solve this?"
2. If possible, define the difficulty level with a prefix in subject
like [E] [M] [H] to represent easy, medium hard.
3. If possible, define the category of the problem with a prefix like
[Math] [Algo] [Java] [Riddle].
4. All categories of problems are welcome as long as it has some
difficulty/trick/logic in solving.
5. If you already aware of the problem then you can drop the clues and
let others to attempt the same.
6. Try to provide examples where ever possible to understand better
and quickly.
http://nicepuzzles.blogspot.com/
This link contains some easy and interesting puzzles. If feel like
interesting to discuss then lets start a new thread to do so.