Given an integer n, return the count of all numbers with unique digits, x, where 0 <= x < 10n.
\n
Example 1:
\n\n\nInput: n = 2\nOutput: 91\nExplanation: The answer should be the total numbers in the range of 0 ≤ x < 100, excluding 11,22,33,44,55,66,77,88,99\n\n\n
Example 2:
\n\n\nInput: n = 0\nOutput: 1\n\n\n
\n
Constraints:
\n\n0 <= n <= 8n ，统计并返回各位数字都不同的数字 x 的个数，其中 0 <= x < 10n 。\n\n\n
示例 1：
\n\n\n输入：n = 2\n输出：91\n解释：答案应为除去 11、22、33、44、55、66、77、88、99 外，在 0 ≤ x < 100 范围内的所有数字。 \n\n\n示例 2：
\n\n\n输入：n = 0\n输出：1\n\n
\n\n
提示：
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