leetcode, LC2: evaluate-reverse-polish-notation

1 题目描述 计算逆波兰式（后缀表达式）的值 运算符仅包含"+","-","*“和”/"，被操做数多是整数或其余表达式 例如：web [“2”, “1”, “+”, “3”, “*”] -> ((2 + 1) * 3) -> 9↵ [“4”, “13”, “5”, “/”, “+”] -> (4 + (13 / 5)) -> 6express Evaluate the value of an ar

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