Given meeting time intervals [start, end], determine if a person can attend all meetings.
With intervals = [[0,30],[5,10],[15,20]]:
- Meeting 1: 0-30. Meeting 2: 5-10. Meeting 3: 15-20.
- Meetings 2 and 3 overlap with meeting 1.
- Can't attend all. Return false.
With intervals = [[7,10],[2,4]]:
- Meeting at 2-4 ends before meeting at 7-10 starts.
- No overlap. Can attend all. Return true.
Constraints: intervals.length .