leetcode-problemset/leetcode-cn/originData/letter-tile-possibilities.json

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            "questionId": "1160",
            "questionFrontendId": "1079",
            "categoryTitle": "Algorithms",
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            "title": "Letter Tile Possibilities",
            "titleSlug": "letter-tile-possibilities",
            "content": "<p>You have <code>n</code>&nbsp;&nbsp;<code>tiles</code>, where each tile has one letter <code>tiles[i]</code> printed on it.</p>\n\n<p>Return <em>the number of possible non-empty sequences of letters</em> you can make using the letters printed on those <code>tiles</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> tiles = &quot;AAB&quot;\n<strong>Output:</strong> 8\n<strong>Explanation: </strong>The possible sequences are &quot;A&quot;, &quot;B&quot;, &quot;AA&quot;, &quot;AB&quot;, &quot;BA&quot;, &quot;AAB&quot;, &quot;ABA&quot;, &quot;BAA&quot;.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> tiles = &quot;AAABBC&quot;\n<strong>Output:</strong> 188\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> tiles = &quot;V&quot;\n<strong>Output:</strong> 1\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= tiles.length &lt;= 7</code></li>\n\t<li><code>tiles</code> consists of uppercase English letters.</li>\n</ul>\n",
            "translatedTitle": "活字印刷",
            "translatedContent": "<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>\n\n<p><strong>注意：</strong>本题中，每个活字字模只能使用一次。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>\"AAB\"\n<strong>输出：</strong>8\n<strong>解释：</strong>可能的序列为 \"A\", \"B\", \"AA\", \"AB\", \"BA\", \"AAB\", \"ABA\", \"BAA\"。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>\"AAABBC\"\n<strong>输出：</strong>188\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>\"V\"\n<strong>输出：</strong>1</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= tiles.length &lt;= 7</code></li>\n\t<li><code>tiles</code> 由大写英文字母组成</li>\n</ul>\n",
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