单选题：The potential function $$Q$$ of a binomial queue is the number o

The potential function $$Q$$ of a binomial queue is the number of the trees. After merging two binomial queues $$H1$$ with 12 nodes and $$H2$$ with 13 nodes，what is the potential change $$Q (H1+H2)-(Q (H1)+Q (H2))$$ ? @[C](2)

A. 2
B. 0
C. -2
D. -3



A.2
B.0
C.-2
D.-3


答案：C