给定一个合法表达式，其中含有任意合法运算符，包括加减乘除、括号和某些自定义的多元运算符，如何编写一个算法对这个合法表达式求值呢？类似的这类表达式求值问题都可以利用逆波兰算法来求解。本博文将会详解逆波兰算法——通用的表达式求值“利器”。
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