1233. Remove Sub-Folders from the Filesystem | LeetCode 1233 Explained in Java | Code Explanation

Welcome to our coding channel! In this video, we tackle the problem of removing sub-folders from a list of folder paths.

🔍 Problem Overview: Given a list of folder paths, we want to return a list that only includes the top-level folders, excluding any folders that are sub-folders of other folders. For example, if we have the folders ["/a", "/a/b", "/c/d", "/c/d/e", "/c/f"], we should only return ["/a", "/c/d", "/c/f"].

💻 Key Concepts Covered:

Sorting strings lexicographically
Using string manipulation to check for sub-folder relationships
Efficiently managing a list to store valid folder paths
🛠️ Algorithm Steps:

Sort the Folder List: We sort the folder paths to ensure that parent folders come before their sub-folders.
Track Valid Folders: As we iterate through the sorted list, we maintain a variable to keep track of the last added folder that is not a sub-folder.
Check for Sub-Folders: We check if the current folder starts with the last valid folder's path. If not, we add it to our results.
📈 Time and Space Complexity: We discuss the time complexity of our approach and how sorting affects performance, as well as the space complexity required to store the results.

Join us as we walk through the code step-by-step and see how we implement this solution in Java! Whether you're preparing for coding interviews or looking to strengthen your programming skills, this video will provide valuable insights.

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