--- title: "Neetika Khandelwal (@nikki2398) | Hashnode" description: "I write blogs on Java, SpringBott, DSA, ML, & AI—breaking down complex tech for devs at every level. Read the latest articles by Neetika Khandelwal on Hashnode." url: "https://hashnode.com/@nikki2398" --- @nikki2398 # Neetika Khandelwal @nikki2398 · Gurugram, Haryana · Joined August 2023 I write blogs on Java, SpringBott, DSA, ML, & AI—breaking down complex tech for devs at every level. [Website](https://neetika23.github.io/) ### [Time and Space Complexity of Recursion (Part 2)](https://nikkivirus.hashnode.dev/time-and-space-complexity-of-recursion-part-2-2692ecb21009?utm_source=hashnode&utm_medium=feed) Time and Space Complexity for Recursion 6 min read · [nikkivirus.hashnode.dev](https://nikkivirus.hashnode.dev/time-and-space-complexity-of-recursion-part-2-2692ecb21009?utm_source=hashnode&utm_medium=feed) [Aug 5, 2025](https://hashnode.com/posts/time-and-space-complexity-of-recursion-part-2-2692ecb21009/68923c4c6523680f3528c968) ### [Understanding Time and Space Complexity (Part 1)](https://nikkivirus.hashnode.dev/understanding-time-and-space-complexity-part-1?utm_source=hashnode&utm_medium=feed) Imagine you appear for an interview with the top giants. You have been asked a DSA problem, and you have somehow reached a perfect solution. Now, the interviewer asks, 'Could you please let me know the time and space complexity for this code?' After ... 5 min read · [nikkivirus.hashnode.dev](https://nikkivirus.hashnode.dev/understanding-time-and-space-complexity-part-1?utm_source=hashnode&utm_medium=feed) [Jul 25, 2025](https://hashnode.com/posts/understanding-time-and-space-complexity-part-1/6883861cffda6bad107dd555) ### [Level Order Traversal Binary Trees in Python Using Queue](https://nikkivirus.hashnode.dev/level-order-traversal-binary-trees-in-python-using-queue-86304ee218e2?utm_source=hashnode&utm_medium=feed) Introduction Binary Trees are an essential data structure in computer science, which can be used to represent hierarchical data such as family trees, file systems, and organization charts. Traversing a binary tree in level order is a common operation... 7 min read · [nikkivirus.hashnode.dev](https://nikkivirus.hashnode.dev/level-order-traversal-binary-trees-in-python-using-queue-86304ee218e2?utm_source=hashnode&utm_medium=feed) [Jul 21, 2023](https://hashnode.com/posts/level-order-traversal-binary-trees-in-python-using-queue-86304ee218e2/680b7ea9b9c7e1c13b0a57e5) ### [Selenium architecture](https://nikkivirus.hashnode.dev/selenium-architecture-3fce2fc14e82?utm_source=hashnode&utm_medium=feed) Introduction Hello readers, In this piece of article, we are going to learn about selenium architecture. Selenium is an open-source automated testing framework that checks web applications across different browsers. Multiple programming languages can... 5 min read · [nikkivirus.hashnode.dev](https://nikkivirus.hashnode.dev/selenium-architecture-3fce2fc14e82?utm_source=hashnode&utm_medium=feed) [Jul 10, 2023](https://hashnode.com/posts/selenium-architecture-3fce2fc14e82/680b7e7e144b23f62555afc2) ### [Top 10 Data Science Myths Busted](https://nikkivirus.hashnode.dev/top-10-data-science-myths-busted-792f9cf84a08?utm_source=hashnode&utm_medium=feed) Image Source Data Science has emerged as one of the most sought-after career options in recent times, and it’s not surprising given the vast amount of data being generated every day. However, with its popularity, there have been a lot of myths surrou... 6 min read · [nikkivirus.hashnode.dev](https://nikkivirus.hashnode.dev/top-10-data-science-myths-busted-792f9cf84a08?utm_source=hashnode&utm_medium=feed) [Jun 26, 2023](https://hashnode.com/posts/top-10-data-science-myths-busted-792f9cf84a08/680b7e8682076601c77d8468)