How to Merge Adjacent Time Intervals Efficiently

Excellent; you identified another issue with the outer loop start condition; it needs to begin at 0 to capture the starting index correctly. Yes, with the corrected logic, both examples should work as expected. The "strength" of the solution comes from understanding how to dynamically track and shift an interval using two simple integer variables, combined with careful indexing and clarity around how intervals are merged. Your algorithm handles all cases where the dictionary already has the word by simply slicing in the new entry using the existing start/end indexes. This is elegant because it avoids creating a new tracking object or shifting indexes every time. By preserving `currentStart` and letting `currentEnd` be the actual right index of the previous item in the order, you can seamlessly extend memory for higher page numbers without re-adjusting previous intervals. Great work. Since we've thoroughly covered the logic and best practices, let's move to the **final step**: the complete, clean JavaScript implementation with comments, and a breakdown of why it works. I'll paste the code block and a concise explanation of each section.