leetcode-problemset/leetcode-cn/originData/letter-combinations-of-a-phone-number.json

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            "title": "Letter Combinations of a Phone Number",
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            "content": "<p>Given a string containing digits from <code>2-9</code> inclusive, return all possible letter combinations that the number could represent. Return the answer in <strong>any order</strong>.</p>\n\n<p>A mapping of digits to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters.</p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/03/15/1200px-telephone-keypad2svg.png\" style=\"width: 300px; height: 243px;\" />\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> digits = &quot;23&quot;\n<strong>Output:</strong> [&quot;ad&quot;,&quot;ae&quot;,&quot;af&quot;,&quot;bd&quot;,&quot;be&quot;,&quot;bf&quot;,&quot;cd&quot;,&quot;ce&quot;,&quot;cf&quot;]\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> digits = &quot;&quot;\n<strong>Output:</strong> []\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> digits = &quot;2&quot;\n<strong>Output:</strong> [&quot;a&quot;,&quot;b&quot;,&quot;c&quot;]\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= digits.length &lt;= 4</code></li>\n\t<li><code>digits[i]</code> is a digit in the range <code>[&#39;2&#39;, &#39;9&#39;]</code>.</li>\n</ul>\n",
            "translatedTitle": "电话号码的字母组合",
            "translatedContent": "<p>给定一个仅包含数字&nbsp;<code>2-9</code>&nbsp;的字符串，返回所有它能表示的字母组合。答案可以按 <strong>任意顺序</strong> 返回。</p>\n\n<p>给出数字到字母的映射如下（与电话按键相同）。注意 1 不对应任何字母。</p>\n\n<p><img src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2021/11/09/200px-telephone-keypad2svg.png\" style=\"width: 200px;\" /></p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>digits = \"23\"\n<strong>输出：</strong>[\"ad\",\"ae\",\"af\",\"bd\",\"be\",\"bf\",\"cd\",\"ce\",\"cf\"]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>digits = \"\"\n<strong>输出：</strong>[]\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>digits = \"2\"\n<strong>输出：</strong>[\"a\",\"b\",\"c\"]\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= digits.length &lt;= 4</code></li>\n\t<li><code>digits[i]</code> 是范围 <code>['2', '9']</code> 的一个数字。</li>\n</ul>\n",
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