#include<iostream>

class PalindromeNumberSolution {

private:
    void palindromer(unsigned long x, unsigned long *p, unsigned long d, unsigned long *max_d) {
        if (x == 0) return;
        if (d > *max_d) *max_d = d;
        palindromer(x / 10, p, d * 10, max_d);
        *p += x % 10 * (*max_d / d);
        return;
    }
public:
    bool isPalindrome(int x) {
        if (x < 0) return false;
        if (x < 10) return true;

        auto absX = (unsigned long)x;
        std::cout << "absX = " << absX << std::endl;
        unsigned long palindrome = 0;
        unsigned long max_d = 0;
        palindromer(absX, &palindrome, 1, &max_d);
        //std::cout << "reverse(absX) = " << palindrome << std::endl;
        return absX == palindrome;
    }
};