System Engineer

The problem required taking an integer input and verifying whether the sum of the cubes of its digits is equal to the original number. For example, 153 is an Armstrong number because the sum of the cubes of its digits (1³ + 5³ + 3³) equals 153, which matches the original number.

To solve this, I extracted each digit using the modulus operator (% 10), calculated the cube of each digit, and added it to a sum variable. After processing all the digits, I compared the result with the original number to determine whether it is an Armstrong number.

This question was straightforward and mainly tested the basic understanding of loops, arithmetic operations, and conditional logic.

Ninja is playing with numbers but hates when he gets duplicate numbers. Ninja is provided an array, and he wants to remove all duplicate elements and return the array, but he has to maintain the order in which the elements were supplied to him.

• What is CPU scheduling? Name the different scheduling algorithms.
• What is a deadlock? What are its conditions?

• What is the difference between OOP concepts (encapsulation, inheritance, and polymorphism)?
• What is abstraction?
• What is the difference between an array and a linked list? (Learn)

I was given a table (for example, an Employee table) containing columns such as Employee_ID, Name, Salary, and Department. The interviewer asked me to write an SQL query to find the second-highest salary from the table.

Given a singly linked list of integers. Your task is to return the head of the reversed linked list.

For example:

The given linked list is 1 -> 2 -> 3 -> 4-> NULL. Then the reverse linked list is 4 -> 3 -> 2 -> 1 -> NULL and the head of the reversed linked list will be 4.

Follow Up :

Can you solve this problem in O(N) time and O(1) space complexity?

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