mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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175 lines
18 KiB
JSON
175 lines
18 KiB
JSON
{
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"questionId": "2406",
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"title": "Decode the Message",
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"titleSlug": "decode-the-message",
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"content": "<p>You are given the strings <code>key</code> and <code>message</code>, which represent a cipher key and a secret message, respectively. The steps to decode <code>message</code> are as follows:</p>\n\n<ol>\n\t<li>Use the <strong>first</strong> appearance of all 26 lowercase English letters in <code>key</code> as the <strong>order</strong> of the substitution table.</li>\n\t<li>Align the substitution table with the regular English alphabet.</li>\n\t<li>Each letter in <code>message</code> is then <strong>substituted</strong> using the table.</li>\n\t<li>Spaces <code>' '</code> are transformed to themselves.</li>\n</ol>\n\n<ul>\n\t<li>For example, given <code>key = "<u><strong>hap</strong></u>p<u><strong>y</strong></u> <u><strong>bo</strong></u>y"</code> (actual key would have <strong>at least one</strong> instance of each letter in the alphabet), we have the partial substitution table of (<code>'h' -> 'a'</code>, <code>'a' -> 'b'</code>, <code>'p' -> 'c'</code>, <code>'y' -> 'd'</code>, <code>'b' -> 'e'</code>, <code>'o' -> 'f'</code>).</li>\n</ul>\n\n<p>Return <em>the decoded message</em>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/05/08/ex1new4.jpg\" style=\"width: 752px; height: 150px;\" />\n<pre>\n<strong>Input:</strong> key = "the quick brown fox jumps over the lazy dog", message = "vkbs bs t suepuv"\n<strong>Output:</strong> "this is a secret"\n<strong>Explanation:</strong> The diagram above shows the substitution table.\nIt is obtained by taking the first appearance of each letter in "<u><strong>the</strong></u> <u><strong>quick</strong></u> <u><strong>brown</strong></u> <u><strong>f</strong></u>o<u><strong>x</strong></u> <u><strong>j</strong></u>u<u><strong>mps</strong></u> o<u><strong>v</strong></u>er the <u><strong>lazy</strong></u> <u><strong>d</strong></u>o<u><strong>g</strong></u>".\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/05/08/ex2new.jpg\" style=\"width: 754px; height: 150px;\" />\n<pre>\n<strong>Input:</strong> key = "eljuxhpwnyrdgtqkviszcfmabo", message = "zwx hnfx lqantp mnoeius ycgk vcnjrdb"\n<strong>Output:</strong> "the five boxing wizards jump quickly"\n<strong>Explanation:</strong> The diagram above shows the substitution table.\nIt is obtained by taking the first appearance of each letter in "<u><strong>eljuxhpwnyrdgtqkviszcfmabo</strong></u>".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>26 <= key.length <= 2000</code></li>\n\t<li><code>key</code> consists of lowercase English letters and <code>' '</code>.</li>\n\t<li><code>key</code> contains every letter in the English alphabet (<code>'a'</code> to <code>'z'</code>) <strong>at least once</strong>.</li>\n\t<li><code>1 <= message.length <= 2000</code></li>\n\t<li><code>message</code> consists of lowercase English letters and <code>' '</code>.</li>\n</ul>\n",
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"difficulty": "Easy",
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"exampleTestcases": "\"the quick brown fox jumps over the lazy dog\"\n\"vkbs bs t suepuv\"\n\"eljuxhpwnyrdgtqkviszcfmabo\"\n\"zwx hnfx lqantp mnoeius ycgk vcnjrdb\"",
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"categoryTitle": "Algorithms",
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"name": "Hash Table",
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"code": "class Solution(object):\n def decodeMessage(self, key, message):\n \"\"\"\n :type key: str\n :type message: str\n :rtype: str\n \"\"\"\n ",
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"code": "# @param {String} key\n# @param {String} message\n# @return {String}\ndef decode_message(key, message)\n \nend",
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"lang": "Erlang",
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"code": "-spec decode_message(Key :: unicode:unicode_binary(), Message :: unicode:unicode_binary()) -> unicode:unicode_binary().\ndecode_message(Key, Message) ->\n .",
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"Iterate through the characters in the key to construct a mapping to the English alphabet.",
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"Make sure to check that the current character is not already in the mapping (only the first appearance is considered).",
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"Map the characters in the message according to the constructed mapping."
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],
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"sampleTestCase": "\"the quick brown fox jumps over the lazy dog\"\n\"vkbs bs t suepuv\"",
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