Nokia Software Engineer Interview Questions and Answers

Identify duplicates in an array using various methods like hashing, sorting, or nested loops.

• 1. Hashing: Use a hash set to track seen elements. Example: For ['apple', 'banana', 'apple'], add to set and check for duplicates.

• 2. Sorting: Sort the array and check adjacent elements. Example: For ['banana', 'apple', 'apple'], sort to ['apple', 'apple', 'banana'] and find duplicates.

• 3. Nested Loops: Compare each element ...read more

Binary search is an efficient algorithm for finding an item from a sorted list of items.

• Requires a sorted array to function correctly.

• Divides the search interval in half with each iteration.

• If the target value is less than the middle element, search the left half.

• If the target value is greater, search the right half.

• Example: Searching for 7 in [1, 3, 5, 7, 9] results in finding 7 at index 3.

To avoid overfitting of ML model, use techniques like cross-validation, regularization, early stopping, and increasing training data.

• Use cross-validation to evaluate model performance on different subsets of data.

• Apply regularization techniques like L1 or L2 regularization to penalize complex models.

• Implement early stopping to prevent the model from training for too long and overfitting.

• Increase training data to p...read more

The OSI model is a conceptual framework that defines the functions of a network protocol stack.

• The OSI model consists of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has its own specific functions and protocols.

• The model helps in understanding how different network protocols interact and communicate with each other.

• For example, when you open a website in ...read more

Reversing a linked list involves changing the direction of the pointers between nodes.

• Iterative approach: Use three pointers (prev, current, next) to reverse links.

• Example: For list 1 -> 2 -> 3, after reversal it becomes 3 -> 2 -> 1.

• Recursive approach: Reverse the rest of the list and adjust pointers.

• Example: Base case when current is null, then set head to last node.

By providing self-service options and resources, such as FAQs and online documentation.

• Create a comprehensive FAQ section on the company's website

• Develop an online knowledge base with step-by-step guides and troubleshooting tips

• Offer live chat support with automated responses and chatbots

• Provide video tutorials and instructional videos

• Implement a community forum where customers can help each other

I have read several technical books on programming languages, algorithms, and software design.

• Clean Code by Robert C. Martin

• The Pragmatic Programmer by Andrew Hunt and David Thomas

• Cracking the Coding Interview by Gayle Laakmann McDowell

• Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides