逆波兰表达式
RPN
Reverse Polish Notation
逆波兰表示法 / 后缀表示法
LeetCode
evaluate-reverse-polish-notation
https://leetcode.com/problems/evaluate-reverse-polish-notation/
https://leetcode-cn.com/problems/evaluate-reverse-polish-notation/
refs
https://en.wikipedia.org/wiki/Reverse_Polish_notation
https://www.zhihu.com/question/41103160
https://www.cnblogs.com/lulipro/p/7450886.html
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