下列关键字序列中,()是堆。 16,72,31,23,94,53 94,23,31,72,16,53 16,53,23,94,31,72 16,23,53,31,94,72
16,72,31,23,94,53
94,23,31,72,16,53
16,53,23,94,31,72
16,23,53,31,94,72