[LeetCode]#9. Palindrome Number

Environment: Python 3.7

Key technique: abs

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

Analysis:

1. If input <0; return False
2. If input >0; input switch location such as “123” to "321"
3. If input == switched input; return True

Solution:

class Solution:
    def isPalindrome(self, x):
        if x<0:
            return False
        s = int(str(abs(x))[::-1])
        if(x == s):
            return True

Submissions:

Reference:

https://leetcode.com/problems/palindrome-number/discuss/824071/Python-Simplest-using-string