code: def minMeetingRooms(self, intervals: List[List[int]]) -> int:
      # One heap solution (equivalent to sorting), time complexity O(nlogn), space complexity O(n)
      heap = []
      intervals.sort(key=lambda x: x[0])
      print(intervals)
      for meeting in intervals:
          if not heap:
              heapq.heappush(heap, meeting[1])
          else:
              if meeting[0] >= heap[0]:
                  heapq.heappop(heap)
              heapq.heappush(heap, meeting[1])
  
      return len(heap)
  
label_desc: Use image node_id 1 for calling the Solution obj's underlying member method code with example usage: obj.minMeetingRooms(intervals) and returns: len