'''

Reverse digits of an integer.

Example1: x = 123, return 321

Example2: x = -123, return -321

'''

class Solution(object):

def reverse(self, x):

res = int(str(abs(x))[::-1])

if x < 0:

res = -res

if res > 2147483647 or res < -2147483648:

res = 0

return res

# without str()

def reverse2(self, x): from math import log

if x < 10 and x > -10:

return x

flipped = False

if x < 0:

flipped = True

x *= -1

res = 0

log10 = int(log(x, 10))

for i in xrange(log10 + 1):

digit = x % 10

res += digit * 10**(log10 - i)

x /= 10

if res > 2**31 - 1 or res < -1 * 2**31 + 1:

return 0

if flipped:

res *= -1

return res