Minimum Number of Meeting Rooms (Intervals as List<List<Integer>> )

Given a list of meeting time intervals meetingTimings of type List<List<Integer>>, where each interval is [start, end] with start < end. A meeting can start exactly when another one ends. Return the minimum number of conference rooms required to hold all the meetings. Input format: one line containing a JSON-like array of intervals, e.g. [[0,30],[5,10],[15,20]]. Output format: print one integer, the minimum number of rooms needed. Constraints: 1 <= n <= 1e5 0 <= start < end <= 1e9 Example: Input: [[0,30],[5,10],[15,20]] Output: 2 Example Input [[0,30],[5,10],[15,20]] Output 2