mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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171 lines
21 KiB
JSON
171 lines
21 KiB
JSON
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"questionId": "1516",
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"categoryTitle": "Algorithms",
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"title": "The k-th Lexicographical String of All Happy Strings of Length n",
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"content": "<p>A <strong>happy string</strong> is a string that:</p>\n\n<ul>\n\t<li>consists only of letters of the set <code>['a', 'b', 'c']</code>.</li>\n\t<li><code>s[i] != s[i + 1]</code> for all values of <code>i</code> from <code>1</code> to <code>s.length - 1</code> (string is 1-indexed).</li>\n</ul>\n\n<p>For example, strings <strong>"abc", "ac", "b"</strong> and <strong>"abcbabcbcb"</strong> are all happy strings and strings <strong>"aa", "baa"</strong> and <strong>"ababbc"</strong> are not happy strings.</p>\n\n<p>Given two integers <code>n</code> and <code>k</code>, consider a list of all happy strings of length <code>n</code> sorted in lexicographical order.</p>\n\n<p>Return <em>the kth string</em> of this list or return an <strong>empty string</strong> if there are less than <code>k</code> happy strings of length <code>n</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 1, k = 3\n<strong>Output:</strong> "c"\n<strong>Explanation:</strong> The list ["a", "b", "c"] contains all happy strings of length 1. The third string is "c".\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 1, k = 4\n<strong>Output:</strong> ""\n<strong>Explanation:</strong> There are only 3 happy strings of length 1.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3, k = 9\n<strong>Output:</strong> "cab"\n<strong>Explanation:</strong> There are 12 different happy string of length 3 ["aba", "abc", "aca", "acb", "bab", "bac", "bca", "bcb", "cab", "cac", "cba", "cbc"]. You will find the 9<sup>th</sup> string = "cab"\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10</code></li>\n\t<li><code>1 <= k <= 100</code></li>\n</ul>\n",
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"translatedTitle": "长度为 n 的开心字符串中字典序第 k 小的字符串",
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"translatedContent": "<p>一个 「开心字符串」定义为：</p>\n\n<ul>\n\t<li>仅包含小写字母 <code>['a', 'b', 'c']</code>.</li>\n\t<li>对所有在 <code>1</code> 到 <code>s.length - 1</code> 之间的 <code>i</code> ，满足 <code>s[i] != s[i + 1]</code> （字符串的下标从 1 开始）。</li>\n</ul>\n\n<p>比方说，字符串 <strong>"abc"</strong>，<strong>"ac"，"b"</strong> 和 <strong>"abcbabcbcb"</strong> 都是开心字符串，但是 <strong>"aa"</strong>，<strong>"baa"</strong> 和 <strong>"ababbc"</strong> 都不是开心字符串。</p>\n\n<p>给你两个整数 <code>n</code> 和 <code>k</code> ，你需要将长度为 <code>n</code> 的所有开心字符串按字典序排序。</p>\n\n<p>请你返回排序后的第 k 个开心字符串，如果长度为 <code>n</code> 的开心字符串少于 <code>k</code> 个，那么请你返回 <strong>空字符串</strong> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>n = 1, k = 3\n<strong>输出：</strong>"c"\n<strong>解释：</strong>列表 ["a", "b", "c"] 包含了所有长度为 1 的开心字符串。按照字典序排序后第三个字符串为 "c" 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>n = 1, k = 4\n<strong>输出：</strong>""\n<strong>解释：</strong>长度为 1 的开心字符串只有 3 个。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>n = 3, k = 9\n<strong>输出：</strong>"cab"\n<strong>解释：</strong>长度为 3 的开心字符串总共有 12 个 ["aba", "abc", "aca", "acb", "bab", "bac", "bca", "bcb", "cab", "cac", "cba", "cbc"] 。第 9 个字符串为 "cab"\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre><strong>输入：</strong>n = 2, k = 7\n<strong>输出：</strong>""\n</pre>\n\n<p><strong>示例 5：</strong></p>\n\n<pre><strong>输入：</strong>n = 10, k = 100\n<strong>输出：</strong>"abacbabacb"\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10</code></li>\n\t<li><code>1 <= k <= 100</code></li>\n</ul>\n\n<p> </p>\n",
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"Generate recursively all the happy strings of length n.",
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