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36 lines
888 B
HTML
36 lines
888 B
HTML
<p>你有一套活字字模 <code>tiles</code>，其中每个字模上都刻有一个字母 <code>tiles[i]</code>。返回你可以印出的非空字母序列的数目。</p>
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<p><strong>注意：</strong>本题中，每个活字字模只能使用一次。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>"AAB"
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<strong>输出：</strong>8
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<strong>解释：</strong>可能的序列为 "A", "B", "AA", "AB", "BA", "AAB", "ABA", "BAA"。
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>"AAABBC"
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<strong>输出：</strong>188
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</pre>
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<p><strong>示例 3：</strong></p>
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<pre>
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<strong>输入：</strong>"V"
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<strong>输出：</strong>1</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>1 <= tiles.length <= 7</code></li>
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<li><code>tiles</code> 由大写英文字母组成</li>
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</ul>
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