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This Repository Contains:

1. Basic Operation in Stack

2. Circular Tour Problem

3. Count natural numbers whose all permutation is greater than that number

4. Find if an expression has duplicate parenthesis or not

5. Queue based approach for first non-repeating character in a stream

6. Iterative Tower of Hanoi

7. Find maximum of minimum for every window size in a given array

8. Next Greater Element

9. Next Smaller Element

10. Sort a Stack using Recursion

11. Design and Implement Special Stack Data Structure

12. The Celebrity Problem

13. Valid Substring