31. Which stack operation is typically used to undo the most recent action in applications?
32. In a stack, what is the term used to describe the condition when elements are removed until it is empty?
33. How would you implement a stack that supports minimum element retrieval in constant time?
34. Which of the following operations cannot be performed in O(1) time in a stack?
35. What happens when you push an element onto a stack that is already full (in a fixed-size stack)?
36. Which of the following problems can be efficiently solved using a stack?
37. How do you implement a stack using two stacks?
38. What is the typical application of a stack in function calls?
39. What is the time complexity of accessing an element at the bottom of a stack implemented using a linked list?
40. How can you check if a given sequence of brackets is balanced using a stack?
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