PalindromeNumber

Problem

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

Solution

Extract the digits from a number and store them in a list digits. Then compare the list with its reverse digits[::-1] to check if the number is a palindrome.

Code

https://github.com/GeorgeRPu/tech-interview-prep/blob/main/solutions/PalindromeNumber.py

def isPalindrome(x: int) -> bool:
    """Check if a number is a palindrome.
    """
    if x < 0:
        return False

    digits = []
    while x > 0:
        digit = x % 10
        x //= 10
        digits.append(digit)

    return digits == digits[::-1]

Test

>>> from PalindromeNumber import isPalindrome
>>> isPalindrome(121)
True
>>> isPalindrome(-121)
False
>>> isPalindrome(10)
False

Functions

isPalindrome(x)

Check if a number is a palindrome.