Graduate intern

You must implement the Stack data structure using a Singly Linked List.

Create a class named 'Stack' which supports the following operations(all in O(1) time):

getSize: Returns an integer. Gets the current size of the stack

isEmpty: Returns a boolean. Gets whether the stack is empty

push: Returns nothing. Accepts an integer. Puts that integer at the top of the stack

pop: Returns nothing. Removes the top element of the stack. It does nothing if the stack is empty.

getTop: Returns an integer. Gets the top element of the stack. Returns -1 if the stack is empty

Implement a Queue Data Structure specifically to store integer data using a Singly Linked List or an array.

You need to implement the following public functions :

1. Constructor: It initializes the data members as required.

2. enqueue(data): This function should take one argument of type integer. It enqueues the element into the queue.

3. dequeue(): It dequeues/removes the element from the front of the queue and in turn, returns the element being dequeued or removed. In case the queue is empty, it returns -1.

4. front(): It returns the element being kept at the front of the queue. In case the queue is empty, it returns -1.

5. isEmpty(): It returns a boolean value indicating whether the queue is empty or not.

Operations Performed on the Queue :

Query-1(Denoted by an integer 1): Enqueues integer data to the queue.

Query-2(Denoted by an integer 2): Dequeues the data kept at the front of the queue and returns it to the caller, return -1 if no element is present in the queue.

Query-3(Denoted by an integer 3): Fetches and returns the data being kept at the front of the queue but doesn't remove it, unlike the dequeue function, return -1 if no element is present in the queue.

Query-4(Denoted by an integer 4): Returns a boolean value denoting whether the queue is empty or not.

You are given a singly linked list of integers.

Your task is to swap every two adjacent nodes, and return the head of the modified, linked list.

For Example:

We have a linked list 1->2->3->4->5->6->7 and so on. You are supposed to swap pairs of a linked list like swap (1,2), (3,4), (5,6), and so on.

Note:

1. You may not modify the data in the list’s nodes; only nodes themselves may be changed. Because imagine a case where a node contains many fields, so there will be too much unnecessary swap.

2. If a pair of a node does not exist, then leave the node as it is.

You are given a Singly Linked List of integers and a reference to the node to be deleted. Every node of the Linked List has a unique value written on it. Your task is to delete that node from the linked list.

A singly linked list is a linear data structure in which we can traverse only in one direction i.e. from Head to Tail. It consists of several nodes where each node contains some data and a reference to the next node.

Note:

• The reference to the head of the linked list is not given.
• The node to be deleted is not a tail node.
• The value of each node in the Linked List is unique.
• It is guaranteed that the node to be deleted is present in the linked list.

A sample Linked List-

Given two variables ‘X’ and ‘Y’. Your task is to swap the number without using a temporary variable or third variable.

Swap means the value of ‘X’ and ‘Y’ must be interchanged. Take an example ‘X’ is 10 and ‘Y’ is 20 so your function must return ‘X’ as a 20 and ‘Y’ as a 10.

Given 3 tables and a problem statement on how to get the data

1. Used inner join and where conditions to get the data
2. For another question, used group by and sum, count functions ( this question is based on how to get the Ntg highest salary)

• Explain your projects
• Which method and logics were used?
• What are the improvements you want to make if you are given a chance?
• How you did the analysis

• What were your post graduation subjects?
• What technologies you learnt during your post graduation?
• Which subject of your post graduation do you liked the most? Why?

• Tell me about yourself
• Why do you want to join Dell?
• What do you like most about Dell?
• What is your expected joining date and stipend?