Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.
Assume the environment does not allow you to store 64-bit integers (signed or unsigned).
Example 1:
Input: x = 123
Output: 321
Example 2:
Input: x = -123
Output: -321
Example 3:
Input: x = 120
Output: 21
Constraints:
-
-231 <= x <= 231 - 1
SOLUTION:
import math
class Solution:
def reverse(self, x: int) -> int:
LIMIT = (1 << 31) - 1
if x == 0:
return x
sign = x//abs(x)
x = abs(x)
op = 0
while x > 0:
d = x % 10
x = x // 10
op = 10 * op + d
if (sign == 1 and op > LIMIT) or (sign == -1 and op > LIMIT + 1):
return 0
return op * sign
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