Summer Intern Analyst Interview Questions and Answers

Swap two numbers using only 2 variables

• Use XOR operation to swap two numbers without using a third variable

• Example: a = 5, b = 10; a = a ^ b; b = a ^ b; a = a ^ b; // a = 10, b = 5

To delete a node in a linked list, we need to adjust the pointers of the previous and next nodes.

• Find the node to be deleted by traversing the linked list

• Adjust the pointers of the previous and next nodes to skip the node to be deleted

• Free the memory occupied by the node to be deleted

Design a system using EC2 instance Fleet on Leetcode platform

• Utilize EC2 instance Fleet to manage a group of EC2 instances for scalability and cost-efficiency

• Implement load balancing to distribute incoming traffic across multiple EC2 instances

• Use auto-scaling to automatically adjust the number of EC2 instances based on traffic demand

• Monitor system performance and health using CloudWatch metrics and alarms

Quick sort is a popular sorting algorithm that uses divide and conquer strategy.

• Divide the array into two sub-arrays based on a pivot element

• Recursively sort the sub-arrays

• Combine the sorted sub-arrays

Recursion is a programming technique where a function calls itself in order to solve a problem.

• Recursion involves breaking down a problem into smaller subproblems and solving them recursively.

• A base case is needed to stop the recursion and prevent infinite loops.

• Examples of recursive functions include factorial calculation and Fibonacci sequence generation.