fix: 增加关键点

azl397985856 · Mar 11, 2021 · c5bdb5a · c5bdb5a
1 parent 57ab9b2
commit c5bdb5a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/problems/227.basic-calculator-ii.md b/problems/227.basic-calculator-ii.md
@@ -102,6 +102,7 @@ https://leetcode-cn.com/problems/basic-calculator-ii/
 
 ## 关键点解析
 
+- 区分一目和二目运算符，并使用栈来简化操作
 - 记录 pre_flag，即上一次出现的操作符
 - 使用哨兵简化操作。一个是 s 的 $ ，另一个是 pre_flag 的 +
 
@@ -212,7 +213,6 @@ class Solution:
                     pre_flag = c
                     num = 0
                 i += 1
-            print(sum(stack))
             return i, sum(stack)
         s += '$'
         return dfs(s, 0)[1]