bool isPalindrome(int x) {
    if(x < 10)
        return x >= 0;
    if(x%10 ==0)
        return false;
    int y = 0,tmp;
    while(x > y)
    {
        tmp = x/10;
        if(tmp == y) return true;
        y = y*10 + (x%10);
        x = tmp;
    }
    return x==y;
}