maxheap.py #597
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maxheap.py #597
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Since Python's heapq implementation does not have built in support for max heap, we can just invert the values stored into the heap so it functions as a max heap. Max heap is better than min heap because we don't actually have to store all N points into the heap, we just need to keep K min points.
Time Complexity: O(N Log(K))
Space Complexity: O(K)