Given a string n representing an integer, return the closest integer (not including itself), which is a palindrome. If there is a tie, return the smaller one.
The closest is defined as the absolute difference minimized between two integers.
\n\n\n
Example 1:
\n\n\nInput: n = "123"\nOutput: "121"\n\n\n
Example 2:
\n\n\nInput: n = "1"\nOutput: "0"\nExplanation: 0 and 2 are the closest palindromes but we return the smallest which is 0.\n\n\n
\n
Constraints:
\n\n1 <= n.length <= 18n consists of only digits.n does not have leading zeros.n is representing an integer in the range [1, 1018 - 1].给定一个表示整数的字符串 n ，返回与它最近的回文整数（不包括自身）。如果不止一个，返回较小的那个。
“最近的”定义为两个整数差的绝对值最小。
\n\n\n\n
示例 1:
\n\n\n输入: n = \"123\"\n输出: \"121\"\n\n\n
示例 2:
\n\n\n输入: n = \"1\"\n输出: \"0\"\n解释: 0 和 2是最近的回文，但我们返回最小的，也就是 0。\n\n\n
\n\n
提示:
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