对于n个元素的关键宇序列{k1,k2,...kn}，当且仅当满足关系ki≤k2i且ki≤k2i+1{i=1.2...[n/2]}时称其为小根堆（小顶堆）。以下序列中，（60）不是小根堆。
A16,25,40,55,30,50,45
B16,40,25,50,45,30,55
C16,25,39.,41,45,43,50
D16,40,25,53,39,55,45
A16,25,40,55,30,50,45
B16,40,25,50,45,30,55
C16,25,39.,41,45,43,50
D16,40,25,53,39,55,45