Site Reliability Engineer

Create a stack data structure that allows operations such as push (adding an element), pop (removing the top element), top (retrieving the top element), and also provides a way to retrieve the minimum element in constant time.

Implement the following public functions :

1. push(data) :
This function should take one argument of type integer. It pushes the element into the stack and returns nothing.

2. pop() :
It pops the element from the top of the stack and returns nothing.

3. top() :
It returns the element being kept at the top of the stack.

4.  getMin() :
It returns the smallest element present in the stack.

Operations Performed on the Stack:

Query-1(Denoted by an integer 1): Pushes integer data to the stack. (push function)

Query-2(Denoted by an integer 2): Pops the data kept at the top of the stack. (pop function)

Query-3(Denoted by an integer 3): Fetches and returns the data being kept at the top of the stack. (top function)

Query-4(Denoted by an integer 4): Returns the smallest element present in the stack. (getMin() function)

Ninjas is practicing problems on the linked list. He came across a problem in which he has given a linked list of ‘N’ nodes and two integers, ‘LOW’ and ‘HIGH’. He has to return the linked list ‘HEAD’ after reversing the nodes between ‘LOW’ and ‘HIGH’, including the nodes at positions ‘LOW’ and ‘HIGH’.

You have been given a long type array/list 'arr’ of size 'n’.

It represents an elevation map wherein 'arr[i]’ denotes the elevation of the 'ith' bar.

Print the total amount of rainwater that can be trapped in these elevations.

Note :

The width of each bar is the same and is equal to 1.

Example:

Input: ‘n’ = 6, ‘arr’ = [3, 0, 0, 2, 0, 4].

Output: 10

Explanation: Refer to the image for better comprehension:

Note :

You don't need to print anything. It has already been taken care of. Just implement the given function.

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