9. Palindrome number

math

Palindrome Number - LeetCode

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

  • code
class Solution:
    def isPalindrome(self, x: int) -> bool:
        ans = 0
        num = x
        if x < 0:
            return False
        while num:
            ans *= 10
            ans += num % 10
            num = num//10
            
        return ans == x
  • code
class Solution:
    def isPalindrome(self, x: int) -> bool:
        strx = str(x)
        return strx == strx[::-1]