Solve LeetCode 2150 – Find Lonely Numbers using an efficient and easy‑to‑understand Java solution! In this video, we break down the logic step‑by‑step, explain how to use a HashMap to track frequencies, and walk you through the optimal approach to identify lonely numbers in an array.
Whether you're preparing for coding interviews, improving your DSA foundations, or practicing LeetCode daily challenges, this tutorial will help you master the problem quickly and confidently.
💡 What You’ll Learn:
What “lonely numbers” mean in the context of LeetCode 2150
How to use frequency maps (HashMap) in Java
Time & space complexity breakdown
Clean, readable Java code
Walkthrough with the sample input:
Input: nums = [1,3,5,3]
Output: [1,5]
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