9. Palindrome Number

https://leetcode.com/problems/palindrome-number/description/

Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.

Example 1:

Input: 121
Output: true

Example 2:

Input: -121
Output: false
Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.

Example 3:

Input: 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.

Follow up:

Coud you solve it without converting the integer to a string?

Solution1:

class Solution(object):
    def isPalindrome(self, x):
        """
        :type x: int
        :rtype: bool
        """
        if x < 0: return False
        else:
            s = str(x)
            l = len(s)
            for ss in s:
                if ss != s[l-1]:
                    return False
                l -= 1
        return True

Solution2:

class Solution(object):
    def isPalindrome(self, x):
        """
        :type x: int
        :rtype: bool
        """
        if (x < 0) or (x != 0 and x%10 == 0): return False
        y = 0
        while x > y:
            y = y*10 + x%10
            x = x/10
        if (x == y) or (y/10 == x): return True
        else: return False