L&T Energy Hydrocarbon Interview Questions and Answers

The first question is about a single linked list problem, and the second question is about substring matching.

• For the single linked list problem, you may need to implement operations like insertion, deletion, and traversal.

• For substring matching, you can use algorithms like brute force, Knuth-Morris-Pratt, or Boyer-Moore.

• Examples for the single linked list problem: reversing a linked list, finding the middle element, or detecting a loop.

• Examples for substring matching: findin...read more

The question is about understanding the timing and order of operations in a system.

• Understanding the sequence of events in a system is crucial for ensuring proper functionality.

• Timing considerations include when data is processed, when actions are triggered, and when resources are allocated.

• Examples include knowing when to update a database record after receiving user input, or when to send a notification after a certain event occurs.

shared_ptr is a smart pointer in C++ that manages the memory of a dynamically allocated object.

• shared_ptr helps in managing memory by automatically releasing the memory when the last reference to the object is destroyed.

• It allows multiple shared_ptr instances to share ownership of the same dynamically allocated object.

• shared_ptr uses reference counting to keep track of the number of shared_ptr instances pointing to the object.

• Example: std::shared_ptr ptr = std::make_shared(10...read more

Sample code using AngularJS

• Create a module and controller

• Bind data to HTML using directives

• Use services for data retrieval and manipulation

• Implement two-way data binding

• Example: https://codepen.io/mohit-kumar/pen/ExjJzjM

Pull vs push based system refers to how data is transferred between components in a system.

• Pull system involves the receiver requesting data from the sender when needed.

• Push system involves the sender actively pushing data to the receiver without the receiver requesting it.

• Pull systems are more efficient when the receiver does not need data constantly.

• Push systems are more efficient when real-time data updates are required.

• Examples: Pull - HTTP polling, Push - WebSockets.