Imagine you are running a backend service that has thousands of tasks waiting to be processed. Some tasks are normal. Some are urgent. Some have been waiting for a long time. Some consume significantly more CPU than others. Now suppose your worker has capacity to process only one task at a time. Which task should … Read more
If you have worked on a backend application, chances are you have used a hash table even if you didn’t explicitly think about it. A Dictionary<TKey, TValue> in C# is a hash table. A cache backed by Redis relies heavily on key-based lookup. A database index is designed around the same broader idea: make finding … Read more
Arrays and strings are usually among the first topics we learn when starting with data structures and algorithms. At first, the problems seem straightforward: Then the problems start getting interesting. You are given a large array and asked to find a particular subarray. You need to process millions of events and identify activity within a … Read more
A Complete Guide with LeetCode Examples, Patterns, and Interview Tips By Dhirendra Singh Negi Table of Contents Introduction The Sliding Window technique is one of the most frequently asked coding interview topics in companies like: If you’ve solved problems like: then you’ve already used the Sliding Window technique. The biggest advantage is reducing an O(n²) … Read more
Want to solve array problems in O(n) instead of O(n²)? The Two Pointer technique is one of the first optimization patterns every software engineer should master. Whether you’re preparing for any interview Google, Microsoft, Amazon, or any product-based company, understanding the Two Pointer technique can turn brute-force solutions into elegant, interview-winning algorithms. In this guide, … Read more
Hey there! If you’re dipping your toes into programming or prepping for that big coding interview, you’ve probably heard about searching algorithms. They’re like the detectives of the data world – hunting down that one piece of info in a sea of numbers or names. In this chatty guide, we’re going to cozy up with … Read more