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add leetcode problem-cn part1

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2022-03-27 20:37:52 +08:00
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算法题（国内版）/problem (Chinese)/活字印刷 [letter-tile-possibilities].html Normal file
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<p>你有一套活字字模&nbsp;<code>tiles</code>，其中每个字模上都刻有一个字母&nbsp;<code>tiles[i]</code>。返回你可以印出的非空字母序列的数目。</p>
<p><strong>注意：</strong>本题中，每个活字字模只能使用一次。</p>
<p>&nbsp;</p>
<p><strong>示例 1：</strong></p>
<pre>
<strong>输入：</strong>"AAB"
<strong>输出：</strong>8
<strong>解释：</strong>可能的序列为 "A", "B", "AA", "AB", "BA", "AAB", "ABA", "BAA"。
</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>"AAABBC"
<strong>输出：</strong>188
</pre>
<p><strong>示例 3：</strong></p>
<pre>
<strong>输入：</strong>"V"
<strong>输出：</strong>1</pre>
<p>&nbsp;</p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 &lt;= tiles.length &lt;= 7</code></li>
<li><code>tiles</code> 由大写英文字母组成</li>
</ul>