leetcode-problemset/leetcode-cn/originData/longest-subsequence-repeated-k-times.json

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        "question": {
            "questionId": "2140",
            "questionFrontendId": "2014",
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            "title": "Longest Subsequence Repeated k Times",
            "titleSlug": "longest-subsequence-repeated-k-times",
            "content": "<p>You are given a string <code>s</code> of length <code>n</code>, and an integer <code>k</code>. You are tasked to find the <strong>longest subsequence repeated</strong> <code>k</code> times in string <code>s</code>.</p>\n\n<p>A <strong>subsequence</strong> is a string that can be derived from another string by deleting some or no characters without changing the order of the remaining characters.</p>\n\n<p>A subsequence <code>seq</code> is <strong>repeated</strong> <code>k</code> times in the string <code>s</code> if <code>seq * k</code> is a subsequence of <code>s</code>, where <code>seq * k</code> represents a string constructed by concatenating <code>seq</code> <code>k</code> times.</p>\n\n<ul>\n\t<li>For example, <code>&quot;bba&quot;</code> is repeated <code>2</code> times in the string <code>&quot;bababcba&quot;</code>, because the string <code>&quot;bbabba&quot;</code>, constructed by concatenating <code>&quot;bba&quot;</code> <code>2</code> times, is a subsequence of the string <code>&quot;<strong><u>b</u></strong>a<strong><u>bab</u></strong>c<strong><u>ba</u></strong>&quot;</code>.</li>\n</ul>\n\n<p>Return <em>the <strong>longest subsequence repeated</strong> </em><code>k</code><em> times in string </em><code>s</code><em>. If multiple such subsequences are found, return the <strong>lexicographically largest</strong> one. If there is no such subsequence, return an <strong>empty</strong> string</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"example 1\" src=\"https://assets.leetcode.com/uploads/2021/08/30/longest-subsequence-repeat-k-times.png\" style=\"width: 457px; height: 99px;\" />\n<pre>\n<strong>Input:</strong> s = &quot;letsleetcode&quot;, k = 2\n<strong>Output:</strong> &quot;let&quot;\n<strong>Explanation:</strong> There are two longest subsequences repeated 2 times: &quot;let&quot; and &quot;ete&quot;.\n&quot;let&quot; is the lexicographically largest one.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;bb&quot;, k = 2\n<strong>Output:</strong> &quot;b&quot;\n<strong>Explanation:</strong> The longest subsequence repeated 2 times is &quot;b&quot;.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;ab&quot;, k = 2\n<strong>Output:</strong> &quot;&quot;\n<strong>Explanation:</strong> There is no subsequence repeated 2 times. Empty string is returned.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == s.length</code></li>\n\t<li><code>2 &lt;= n, k &lt;= 2000</code></li>\n\t<li><code>2 &lt;= n &lt; k * 8</code></li>\n\t<li><code>s</code> consists of lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "重复 K 次的最长子序列",
            "translatedContent": "<p>给你一个长度为 <code>n</code> 的字符串 <code>s</code> ，和一个整数 <code>k</code> 。请你找出字符串 <code>s</code> 中 <strong>重复</strong> <code>k</code> 次的 <strong>最长子序列</strong> 。</p>\n\n<p><strong>子序列</strong> 是由其他字符串删除某些（或不删除）字符派生而来的一个字符串。</p>\n\n<p>如果&nbsp;<code>seq * k</code> 是 <code>s</code> 的一个子序列，其中 <code>seq * k</code> 表示一个由 <code>seq</code> 串联 <code>k</code>&nbsp;次构造的字符串，那么就称 <code>seq</code><strong> </strong>是字符串 <code>s</code> 中一个 <strong>重复 <code>k</code> 次</strong> 的子序列。</p>\n\n<ul>\n\t<li>举个例子，<code>\"bba\"</code> 是字符串 <code>\"bababcba\"</code> 中的一个重复 <code>2</code> 次的子序列，因为字符串 <code>\"bbabba\"</code> 是由 <code>\"bba\"</code> 串联 <code>2</code> 次构造的，而&nbsp;<code>\"bbabba\"</code> 是字符串 <code>\"<em><strong>b</strong></em>a<em><strong>bab</strong></em>c<em><strong>ba</strong></em>\"</code> 的一个子序列。</li>\n</ul>\n\n<p>返回字符串 <code>s</code> 中 <strong>重复 k 次的最长子序列</strong>&nbsp; 。如果存在多个满足的子序列，则返回 <strong>字典序最大</strong> 的那个。如果不存在这样的子序列，返回一个 <strong>空</strong> 字符串。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img alt=\"example 1\" src=\"https://assets.leetcode.com/uploads/2021/08/30/longest-subsequence-repeat-k-times.png\" style=\"width: 457px; height: 99px;\" /></p>\n\n<pre>\n<strong>输入：</strong>s = \"letsleetcode\", k = 2\n<strong>输出：</strong>\"let\"\n<strong>解释：</strong>存在两个最长子序列重复 2 次：let\" 和 \"ete\" 。\n\"let\" 是其中字典序最大的一个。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"bb\", k = 2\n<strong>输出：</strong>\"b\"\n<strong>解释：</strong>重复 2 次的最长子序列是 \"b\" 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"ab\", k = 2\n<strong>输出：</strong>\"\"\n<strong>解释：</strong>不存在重复 2 次的最长子序列。返回空字符串。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>n == s.length</code></li>\n\t<li><code>2 &lt;= k &lt;= 2000</code></li>\n\t<li><code>2 &lt;= n &lt; k * 8</code></li>\n\t<li><code>s</code> 由小写英文字母组成</li>\n</ul>\n",
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