def heapsort_test_2(): print(heapsort([0]))
def heapsort_test_1(): print(heapsort([]))
def heapsort_test_6(): print(heapsort([9, 7, 5, 3]))
def heapsort_test_5(): print(heapsort([3, 5, 7, 9]))
def heapsort_test_4(): print(heapsort([4, 2, 8, 3, 6, 1, 6, 3, 6, 30, 20, 10, -5, 7, 3]))
def heapsort_test_3(): print(heapsort([3, 2]))