7. Reverse Integer

Given a 32-bit signed integer, reverse digits of an integer.

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(object):
    def reverse(self, x):
        """
        :type x: int
        :rtype: int
        """
        if (x > 2147483647 and x < -2147483648):
            return 0
        
        x_list = list(str(x))
        
        if x_list[0] == "-":
            x_list = x_list[1:]
            x_list.reverse()
            
            if (int(''.join(x_list)) > 2147483647):
                return 0

            return -int(''.join(x_list))
        else:
            x_list.reverse()
            
            if (int(''.join(x_list)) > 2147483647):
                return 0
            
            return int(''.join(x_list))