0009-palindrome-number.cpp

class Solution {
public:
    bool isPalindrome(int x) {
        if(x < 0) return false;
        
        long div = 1;
        while(x >= 10 * div)
            div *= 10;
        
        while(x) {
            int right = x % 10;
            int left = x / div;
            
            if(left != right) return false;
            
            x = (x % div) / 10;
            div = div / 100;
        }
        return true;
    }
};