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reverse_integer.py
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49 lines (39 loc) · 1001 Bytes
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# 7. Reverse Integer
# https://leetcode.com/problems/reverse-integer
import unittest
class Solution:
def reverse(self, x):
"""
:type x: int
:rtype: int
"""
if -10 < x < 10:
return x
result = 0
is_negative = False
if x < 0:
is_negative = True
x = -x
while x > 0:
tail = x % 10
result = (result * 10) + tail
x = x // 10
if is_negative:
result = -result
if result < -(2 ** 31) or (2 ** 31 - 1) < result:
result = 0
return result
class ReverseTest(unittest.TestCase):
def test_reverse(self):
solution = Solution()
self.assertEqual(
solution.reverse(123), 321
)
self.assertEqual(
solution.reverse(-123), -321
)
self.assertEqual(
solution.reverse(120), 21
)
if __name__ == '__main__':
unittest.main()