Leetcode/9.py at master · ketulsuthar/Leetcode · GitHub

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'''
9. Palindrome Number.

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?
'''

# Solution -1

class Solution(object):
    def isPalindrome(self, x):
        """
        :type x: int
        :rtype: bool
        """
        num,y = 0,x
        while y > 0:
            r = y % 10
            num = (num*10) + r
            y = y / 10

        if num == x:
            return True
        return False

# Solution -2

class Solution(object):
    def isPalindrome(self, x):
        """
        :type x: int
        :rtype: bool
        """
        return str(x) == str(x)[::-1]