sanyinchen
https://leetcode.cn/problems/8Zf90G/description/ 一、题目解析 1.1 题意 逆波兰表达式(Reverse Polish Notation),说白了就是把运算符写在两个操作数后面。比如中缀 (2+1)3 写成后缀就是 ["2","1","+","3",""]——2 1 …
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