leetcode-problemset/leetcode-cn/originData/longest-happy-prefix.json

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            "title": "Longest Happy Prefix",
            "titleSlug": "longest-happy-prefix",
            "content": "<p>A string is called a <strong>happy prefix</strong> if is a <strong>non-empty</strong> prefix which is also a suffix (excluding itself).</p>\n\n<p>Given a string <code>s</code>, return <em>the <strong>longest happy prefix</strong> of</em> <code>s</code>. Return an empty string <code>&quot;&quot;</code> if no such prefix exists.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;level&quot;\n<strong>Output:</strong> &quot;l&quot;\n<strong>Explanation:</strong> s contains 4 prefix excluding itself (&quot;l&quot;, &quot;le&quot;, &quot;lev&quot;, &quot;leve&quot;), and suffix (&quot;l&quot;, &quot;el&quot;, &quot;vel&quot;, &quot;evel&quot;). The largest prefix which is also suffix is given by &quot;l&quot;.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;ababab&quot;\n<strong>Output:</strong> &quot;abab&quot;\n<strong>Explanation:</strong> &quot;abab&quot; is the largest prefix which is also suffix. They can overlap in the original string.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code> contains only lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "最长快乐前缀",
            "translatedContent": "<p><strong>「快乐前缀」</strong>&nbsp;是在原字符串中既是&nbsp;<strong>非空</strong> 前缀也是后缀（不包括原字符串自身）的字符串。</p>\n\n<p>给你一个字符串 <code>s</code>，请你返回它的 <strong>最长快乐前缀</strong>。如果不存在满足题意的前缀，则返回一个空字符串<meta charset=\"UTF-8\" />&nbsp;<code>\"\"</code>&nbsp;。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"level\"\n<strong>输出：</strong>\"l\"\n<strong>解释：</strong>不包括 s 自己，一共有 4 个前缀（\"l\", \"le\", \"lev\", \"leve\"）和 4 个后缀（\"l\", \"el\", \"vel\", \"evel\"）。最长的既是前缀也是后缀的字符串是 \"l\" 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"ababab\"\n<strong>输出：</strong>\"abab\"\n<strong>解释：</strong>\"abab\" 是最长的既是前缀也是后缀的字符串。题目允许前后缀在原字符串中重叠。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code> 只含有小写英文字母</li>\n</ul>\n",
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