9. Palindrome Number
EasyMath
Given an integer x, return true if x is a palindrome, and false otherwise. An integer is a palindrome when it reads the same forward and backward. For example, 121 is a palindrome while 123 is not.
Examples
Input: 1221
Output: true
Explanation: Reversing the back half (12) equals the front half (12).
Constraints
- -2^31 <= x <= 2^31 - 1
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