def build_heap(source: List[int]):
heap = HeapMax(source)
for i in range(heap.size() // 2, -1, -1):
heap.sift_down(i)
return heap
def build_heap(source: List[int]):
heap = HeapMax(source)
for i in range(heap.size() // 2, -1, -1):
heap.sift_down(i)
return heap
