1. Problem
Given an integer x, return true if x is a palindrome, and false otherwise.
Example 1:
Input: x = 121
Output: true
Explanation: 121 reads as 121 from left to right and from right to left.
Example 2:
Input: x = -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: x = 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
Constraints:
- -2^31 <= x <= 2^31 - 1
2. Solution
I solved this problem like this.
- It is so easy!
- You change x to str.
- confirm str(x) and str(x)[::-1] are equal.
class Solution:
def isPalindrome(self, x: int) -> bool:
return str(x) == str(x)[::-1]