9. Palindrome Number Leetcode Python 2016 new Season

Determine whether an integer is a palindrome. Do this without extra space.

click to show spoilers.

Show Tags

Show Similar Problems

The problem requirement doesn't make sense, we still need constant space to do this problem. the time complexity is O(log(n)).

class Solution(object):    def isPalindrome(self, x):        """        :type x: int        :rtype: bool        """        tmp_x = x        residual = 0        while x >= 1:            rest = x % 10            residual = residual * 10 + rest            x /= 10        if tmp_x == residual:            return True        return False