leetcode479. Largest Palindrome Product

Find the largest palindrome made from the product of two n-digit numbers.

Since the result could be very large, you should return the largest palindrome mod 1337.

**Example:**

Input: 2

Output: 987

Explanation: 99 x 91 = 9009, 9009 % 1337 = 987

**Note:**

The range of n is \[1,8\].

    public int largestPalindrome(int n) {
        if(n == 1) return 9;
        int max = (int)Math.pow(10, n) - 1;
        for(int palindromePart = max - 1 ; palindromePart > max / 10 ; palindromePart--) {
            long palindrome = Long.valueOf(palindromePart + new StringBuilder().append(palindromePart).reverse().toString());
            for(long divided = max ; divided * divided >= palindrome ; divided--) {
                if(palindrome % divided == 0) {
                    return (int) (palindrome % 1337);
                }
            }
        }
        return 0;
    }