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@@ -12,7 +12,7 @@
"translatedContent": "<p>在老式手机上用户通过数字键盘输入手机将提供与这些数字相匹配的单词列表。每个数字映射到0至4个字母。给定一个数字序列实现一个算法来返回匹配单词的列表。你会得到一张含有有效单词的列表。映射如下图所示</p>\n\n<p><img src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/original_images/17_telephone_keypad.png\" style=\"width: 200px;\"></p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre><strong>输入:</strong> num = &quot;8733&quot;, words = [&quot;tree&quot;, &quot;used&quot;]\n<strong>输出:</strong> [&quot;tree&quot;, &quot;used&quot;]\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre><strong>输入:</strong> num = &quot;2&quot;, words = [&quot;a&quot;, &quot;b&quot;, &quot;c&quot;, &quot;d&quot;]\n<strong>输出:</strong> [&quot;a&quot;, &quot;b&quot;, &quot;c&quot;]</pre>\n\n<p>提示:</p>\n\n<ul>\n\t<li><code>num.length &lt;= 1000</code></li>\n\t<li><code>words.length &lt;= 500</code></li>\n\t<li><code>words[i].length == num.length</code></li>\n\t<li><code>num</code>中不会出现 0, 1 这两个数字</li>\n</ul>\n",
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"difficulty": "Medium",
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@@ -149,7 +149,7 @@
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"hints": [
"想想递归。",
"你能递归地尝试所有的可能性吗?",