First Non-Repeating Number in an Array | Most Asked DSA Interview Question

In this video, you’ll learn how to find the first non-repeating number in an array — one of the most commonly asked questions in coding interviews. We’ll discuss the problem statement, dry run with example, and logic step-by-step, making it easy to understand even for beginners. By the end of this video, you’ll know: ✅ How to identify the first element that appears only once in an array ✅ Different approaches — using loops and HashMap ✅ Time and space complexity analysis ✅ Common mistakes to avoid in interviews