Merge Overlapping Time Intervals in Ascending Order

amazon Given multiple time intervals, each interval is represented as [start, end] where start < end. Merge all overlapping time intervals and return them in ascending order of their start times. Example Input: [[7, 7], [2, 7], [6, 11], [11, 12]] Output: [[2, 12]] Constraints The number of time intervals is between [1, 10^5]. 0 <= start < end <= 10^9. Example Input [[7, 7], [2, 7], [6, 11], [11, 12]]