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24 lines
1.1 KiB
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24 lines
1.1 KiB
HTML
<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>
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<p><img src="https://assets.leetcode-cn.com/aliyun-lc-upload/original_images/17_telephone_keypad.png" style="width: 200px;"></p>
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<p><strong>示例 1:</strong></p>
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<pre><strong>输入:</strong> num = "8733", words = ["tree", "used"]
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<strong>输出:</strong> ["tree", "used"]
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</pre>
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<p><strong>示例 2:</strong></p>
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<pre><strong>输入:</strong> num = "2", words = ["a", "b", "c", "d"]
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<strong>输出:</strong> ["a", "b", "c"]</pre>
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<p>提示：</p>
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<ul>
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<li><code>num.length <= 1000</code></li>
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<li><code>words.length <= 500</code></li>
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<li><code>words[i].length == num.length</code></li>
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<li><code>num</code>中不会出现 0, 1 这两个数字</li>
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</ul>
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