def main():
heap = BinHeap([10, 5, 2, 9, 3, 6])
heap.print()
min = heap.del_min()
print("delete min=", min)
heap.print()
min = heap.del_min()
print("delete min=", min)
heap.print()
min = heap.del_min()
print("delete min=", min)
heap.print()
