满足最小堆定义的是()
A.{21, 25, 55, 23, 51, 63} B. {21, 51, 55, 63, 25, 23} C.{21, 63, 55, 25, 51, 23} D.{21, 51, 23, 63, 55, 25}
{21, 25, 55, 23, 51, 63}
{21, 51, 55, 63, 25, 23}
{21, 63, 55, 25, 51, 23}
{21, 51, 23, 63, 55, 25}
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