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leetcode 007

admin 11月 13, 2020 0

Reverse Integer
Method
Python Code

Reverse Integer

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

Note:
Assume we are dealing with an environment which could only hold integers within the 32-bit signed integer range. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

Method

Pay attention to the number limited.

Python Code

class Solution(object):
    def reverse(self, x):
        """
        :type x: int
        :rtype: int
        """
        minus = 0
        if x < 0:
            x = -x
            minus = 1
        res = 0
        flag = 0
        while x:
            flag = x % 10
            x = x / 10
            res = res * 10 + flag
        if minus:
            res = -res
        if res <= 0x7fffffff and res >= -0x7fffffff-1:
            return res
        else:
            return 0