Data Structures and Algorithms The Complete Masterclass - Implementing a Min Stack

The video tutorial explains the implementation of a Min Stack class, detailing its methods such as push, pop, top, and get min. The push operation involves adding elements to both the stack and min stack, with conditions to maintain the minimum value. The pop operation removes elements while ensuring the min stack remains accurate. The top and get min methods return the last element of the stack and the minimum value, respectively. The tutorial concludes with a brief mention of the Max Stack, which will be covered in the next lecture.

What is the primary purpose of the min stack in the Min Stack class?

• To store all elements in reverse order

• To keep track of the maximum value

• To maintain the minimum value at any point

• To store elements in sorted order

When adding a new element to the stack, under what condition is it also added to the min stack?

• If the new element is odd

• If the min stack is empty or the new element is less than or equal to the current minimum

• If the new element is a prime number

• If the new element is greater than the current minimum

What happens during the pop operation if the last values of the stack and min stack are equal?

• Both the stack and min stack are popped

• Only the min stack is popped

• Neither stack is popped

• Only the stack is popped

Why is it important to compare the last values of the stack and min stack before popping?

• To verify the stack size

• To check if the stack is sorted

• To maintain the correct minimum value

• To ensure the stack is not empty

What is the purpose of the top operation in the Min Stack class?

• To return the last element of the stack

• To remove the first element from the stack

• To return the minimum element of the stack

• To add a new element to the stack

How does the getMin operation function in the Min Stack class?

• It returns the first element of the stack

• It returns the minimum element from the min stack

• It returns the maximum element from the stack

• It returns the last element of the stack

What is a key difference between a Min Stack and a Max Stack?

• A Min Stack tracks the maximum value, while a Max Stack tracks the minimum value

• A Min Stack tracks the minimum value, while a Max Stack tracks the maximum value

• A Min Stack is used for sorting, while a Max Stack is used for searching

• A Min Stack is faster than a Max Stack