Merge Available Slots

📝 Description

Merge overlapping time slots to show continuous availability.

Input Format

[[start1, end1], [start2, end2], ...] (list of time intervals)

Output Format

[[merged_start, merged_end], ...]

Constraints

1 ≤ number of slots ≤ 10^4, 0 ≤ start < end ≤ 24

🔍 Sample Input

[[9, 11], [10, 12], [14, 16]]
            

✅ Sample Output

[[9, 12], [14, 16]]