[Solved] Given an integer x, return true if x is palindrome integer. An integer is a palindrome when it reads the same backward as forward.

Question

Given an integer x, return true if x is palindrome integer.

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

  • For example, 121 is a palindrome while 123 is not.

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:

  • -231 <= x <= 231 - 1

Follow up: Could you solve it without converting the integer to a string?

Python Solution

class Solution:
    def isPalindrome(self, x: int) -> bool:        
        def reverse(n):
            rev=0
            while n!=0:
                rem = n%10
                rev=rev*10+rem
                n=n//10
            return rev

        if x<0:
            return False
        else:
            return x==reverse(x)
        
Abhishek Sharma
Abhishek Sharma

Started my Data Science journey in my 2nd year of college and since then continuously into it because of the magical powers of ML and continuously doing projects in almost every domain of AI like ML, DL, CV, NLP.

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