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add leetcode problem-cn part6

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算法题（国内版）/problem (Chinese)/计算各个位数不同的数字个数 [count-numbers-with-unique-digits].html Normal file
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<p>给定一个<strong>非负</strong>整数 n，计算各位数字都不同的数字 x 的个数，其中 0 &le; x &lt; 10<sup>n&nbsp;</sup>。</p>
<p><strong>示例:</strong></p>
<pre><strong>输入: </strong>2
<strong>输出: </strong>91
<strong>解释: </strong>答案应为除去 <code>11,22,33,44,55,66,77,88,99 </code>外，在 [0,100) 区间内的所有数字。
</pre>