mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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198 lines
23 KiB
JSON
198 lines
23 KiB
JSON
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"questionId": "1000047",
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"questionFrontendId": "面试题 16.20",
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"categoryTitle": "LCCI",
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"boundTopicId": 101200,
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"title": "T9 LCCI",
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"content": "<p>On old cell phones, users typed on a numeric keypad and the phone would provide a list of words that matched these numbers. Each digit mapped to a set of 0 - 4 letters. Implement an algo­rithm to return a list of matching words, given a sequence of digits. You are provided a list of valid words. The mapping is shown in the diagram below:</p>\r\n\r\n<p><img src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/original_images/17_telephone_keypad.png\" style=\"width: 200px;\" /></p>\r\n\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> num = "8733", words = ["tree", "used"]\r\n<strong>Output:</strong> ["tree", "used"]\r\n</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> num = "2", words = ["a", "b", "c", "d"]\r\n<strong>Output:</strong> ["a", "b", "c"]</pre>\r\n\r\n<p>Note:</p>\r\n\r\n<ul>\r\n\t<li><code>num.length <= 1000</code></li>\r\n\t<li><code>words.length <= 500</code></li>\r\n\t<li><code>words[i].length == num.length</code></li>\r\n\t<li><code>There are no number 0 and 1 in num</code>.</li>\r\n</ul>\r\n",
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"translatedTitle": "T9键盘",
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"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 = "8733", words = ["tree", "used"]\n<strong>输出:</strong> ["tree", "used"]\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre><strong>输入:</strong> num = "2", words = ["a", "b", "c", "d"]\n<strong>输出:</strong> ["a", "b", "c"]</pre>\n\n<p>提示：</p>\n\n<ul>\n\t<li><code>num.length <= 1000</code></li>\n\t<li><code>words.length <= 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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"code": "class Solution(object):\n def getValidT9Words(self, num, words):\n \"\"\"\n :type num: str\n :type words: List[str]\n :rtype: List[str]\n \"\"\"",
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"code": "\n\n/**\n * Note: The returned array must be malloced, assume caller calls free().\n */\nchar** getValidT9Words(char* num, char** words, int wordsSize, int* returnSize){\n\n}\n",
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"code": "# @param {String} num\n# @param {String[]} words\n# @return {String[]}\ndef get_valid_t9_words(num, words)\n\nend",
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"code": "impl Solution {\n pub fn get_valid_t9_words(num: String, words: Vec<String>) -> Vec<String> {\n\n }\n}",
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"code": "-spec get_valid_t9_words(Num :: unicode:unicode_binary(), Words :: [unicode:unicode_binary()]) -> [unicode:unicode_binary()].\nget_valid_t9_words(Num, Words) ->\n .",
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"code": "defmodule Solution do\n @spec get_valid_t9_words(num :: String.t, words :: [String.t]) :: [String.t]\n def get_valid_t9_words(num, words) do\n\n end\nend",
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"hints": [
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"想想递归。",
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"你能递归地尝试所有的可能性吗？",
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"在现实世界中，我们应该知道一些前缀/子字符串是行不通的。例如，考虑数字33835676368。虽然3383确实对应于fftf，但是没有以fftf开头的单词。有没有什么办法对于这样的情况做特殊处理？",
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"trie可以帮助我们。如果将整个单词列表存储在trie中会怎样？",
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"我们可能会多次运行这个算法。如果做更多的预处理，这里有办法优化吗？",
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"通过预处理，实际上可以将查找时间降低到O(1)。"
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"sampleTestCase": "\"8733\"\n[\"tree\", \"used\"]",
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