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请教解题思路。这种方法有点麻烦，自己想的。 首先预处理，将N去掉。 剩下的就全部是二元前缀运算符了。 可以递归分左右子树计算。 想请教一下更简便的方法，例如怎样用栈运算呢？ Followed by:
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