You are given two positive integers n and k.
An integer x is called k-palindromic if:
x is a palindrome.x is divisible by k.Return the largest integer having n digits (as a string) that is k-palindromic.
Note that the integer must not have leading zeros.
\n\n\n
Example 1:
\n\nInput: n = 3, k = 5
\n\nOutput: "595"
\n\nExplanation:
\n\n595 is the largest k-palindromic integer with 3 digits.
\nExample 2:
\n\nInput: n = 1, k = 4
\n\nOutput: "8"
\n\nExplanation:
\n\n4 and 8 are the only k-palindromic integers with 1 digit.
\nExample 3:
\n\nInput: n = 5, k = 6
\n\nOutput: "89898"
\n\n
Constraints:
\n\n1 <= n <= 1051 <= k <= 9给你两个 正整数 n 和 k。
如果整数 x 满足以下全部条件，则该整数是一个 k 回文数：
x 是一个 回文数。x 可以被 k 整除。以字符串形式返回 最大的 n 位 k 回文数。
注意，该整数 不 含前导零。
\n\n\n\n
示例 1：
\n\n输入： n = 3, k = 5
\n\n输出： \"595\"
\n\n解释：
\n\n595 是最大的 3 位 k 回文数。
\n示例 2：
\n\n输入： n = 1, k = 4
\n\n输出： \"8\"
\n\n解释：
\n\n1 位 k 回文数只有 4 和 8。
\n示例 3：
\n\n输入： n = 5, k = 6
\n\n输出： \"89898\"
\n\n\n
提示：
\n\n1 <= n <= 1051 <= k <= 9k.",
"Use string dp, store modulus along with length of number currently formed.",
"Is it possible to solve greedily using divisibility rules?"
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