7. Reverse Integer

class Solution(object):
def reverse(self, x):
"""
:type x: int
:rtype: int
"""
if x < 0:
return -self.reverse(-x)
res = 0
while x:
res = res * 10 + x % 10
x = x // 10
if res > 2**31 - 1:
return 0
return res
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