8. 字符串转换整数 (atoi)
题目
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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| class Solution:
def myAtoi(self, str: str) -> int:
p = ''
str = str.lstrip()
n = ''
min_int = -2**31
max_int = 2**31-1
isnumeric = False
for x in str:
if not isnumeric and x == '-':
p = '-'
isnumeric = True
continue
if not isnumeric and x == '+':
isnumeric = True
continue
if x.isnumeric():
n += x
isnumeric = True
else:
break
if not n:
return 0
if int(n) > max_int:
if p:
return min_int
else:
return max_int
p += n
return int(p)
|
