56 lines
943 B
Markdown
56 lines
943 B
Markdown
---
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title: leetcode-string-to-integer-atoi
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date: 2020-04-16 19:50:10
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tags:
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categories: leetcode
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---
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### 8. 字符串转换整数 (atoi)
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[题目](https://leetcode-cn.com/problems/string-to-integer-atoi/)
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<!--more-->
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没什么好说的，注意各种情况，识别到数字之后就一直要是数字。
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```python
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class Solution:
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def myAtoi(self, str: str) -> int:
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p = ''
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str = str.lstrip()
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n = ''
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min_int = -2**31
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max_int = 2**31-1
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isnumeric = False
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for x in str:
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if not isnumeric and x == '-':
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p = '-'
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isnumeric = True
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continue
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if not isnumeric and x == '+':
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isnumeric = True
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continue
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if x.isnumeric():
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n += x
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isnumeric = True
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else:
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break
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if not n:
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return 0
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if int(n) > max_int:
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if p:
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return min_int
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else:
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return max_int
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p += n
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return int(p)
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# 32 ms 13.6 MB
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```
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