叶权为1,2,3,5,6 的最优二叉树的树权W(T)=____。
Where was Nigel Player's first job?
A. at a transport company
B. at a bank
C. at an electronics firm
Nigel Player left his successful career because he wanted to ______
A. retire from the business world.
B. start a new business.
C. write a business book.
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