Given a 32-bit signed integer, reverse digits of an integer.
Example 1:
---
Input: 123
Output: 321
Example 2:
---
Input: -123
Output: -321
Example 3:
---
Input: 120
Output: 21
Note:
Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−2^31, 2^31 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
class Solution:
def reverse(self, x):
"""
:type x: int
:rtype: int
"""
if x >= 2**31 or x < -2**31:return 0
if x > 0: flag = 1
elif x < 0: flag = -1
else: return 0
x = abs(x)
digits = []
while x != 0:
digits.append(str(x % 10))
x //= 10
out = int(''.join(digits))
if out >= 2**31 or out < -2**31:
return 0
return out*flag
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