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Update 2-stack-ex.md

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Didnelpsun
2022-09-12 23:32:55 +08:00
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@@ -46,6 +46,8 @@ $D.7$
## 栈的应用
### 中缀转后缀
从左到右扫描中缀表达式。遇到数字加入后缀表达式,遇到运算符:
1. 若为“(”,入栈。