Palindrome Number
Given an integer
x, determine whether it is a palindrome. An integer is a palindrome when it reads the same backward as forward. For example, 121 is a palindrome while 123 is not. Implement the solution without converting the integer to a string. Constraints: The input x is a signed 32-bit integer: -2^31 <= x <= 2^31 - 1. Time complexity: O(log n). Space complexity: O(1).PythonMath
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