关键码序列K = { 23 , 40, 28, 19, 20, 42 },经过筛选法建堆过程后,得到的最小堆为 ___ ______ 19,20,28,40,23,42 19,28,20,40,23,42 42,40,28,23,20,19 42,28,40,20,23,19
19,20,28,40,23,42
19,28,20,40,23,42
42,40,28,23,20,19
42,28,40,20,23,19