leetcode-problemset/leetcode-cn/originData/find-the-longest-semi-repetitive-substring.json

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        "question": {
            "questionId": "2786",
            "questionFrontendId": "2730",
            "categoryTitle": "Algorithms",
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            "title": "Find the Longest Semi-Repetitive Substring",
            "titleSlug": "find-the-longest-semi-repetitive-substring",
            "content": "<p>You are given a digit string <code>s</code> that consists of digits from 0 to 9.</p>\n\n<p>A string is called <strong>semi-repetitive</strong> if there is <strong>at most</strong> one adjacent pair of the same digit. For example, <code>&quot;0010&quot;</code>, <code>&quot;002020&quot;</code>, <code>&quot;0123&quot;</code>, <code>&quot;2002&quot;</code>, and <code>&quot;54944&quot;</code> are semi-repetitive while the following are not: <code>&quot;00101022&quot;</code> (adjacent same digit pairs are 00 and 22), and <code>&quot;1101234883&quot;</code> (adjacent same digit pairs are 11 and 88).</p>\n\n<p>Return the length of the <strong>longest semi-repetitive <span data-keyword=\"substring-nonempty\">substring</span></strong> of <code>s</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;52233&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">4</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The longest semi-repetitive substring is &quot;5223&quot;. Picking the whole string &quot;52233&quot; has two adjacent same digit pairs 22 and 33, but at most one is allowed.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;5494&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">4</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><code>s</code> is a semi-repetitive string.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;1111111&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The longest semi-repetitive substring is &quot;11&quot;. Picking the substring &quot;111&quot; has two adjacent same digit pairs, but at most one is allowed.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 50</code></li>\n\t<li><code>&#39;0&#39; &lt;= s[i] &lt;= &#39;9&#39;</code></li>\n</ul>\n",
            "translatedTitle": "找到最长的半重复子字符串",
            "translatedContent": "<p>给你一个下标从 <strong>0</strong>&nbsp;开始的字符串&nbsp;<code>s</code>&nbsp;，这个字符串只包含&nbsp;<code>0</code>&nbsp;到&nbsp;<code>9</code>&nbsp;的数字字符。</p>\n\n<p>如果一个字符串&nbsp;<code>t</code>&nbsp;中至多有一对相邻字符是相等的，那么称这个字符串 <code>t</code> 是 <strong>半重复的</strong>&nbsp;。例如，<code>\"0010\"</code>&nbsp;、<code>\"002020\"</code>&nbsp;、<code>\"0123\"</code>&nbsp;、<code>\"2002\"</code>&nbsp;和 <code>\"54944\"</code>&nbsp;是半重复字符串，而 <code>\"00101022\"</code>&nbsp;（相邻的相同数字对是 00 和 22）和 <code>\"1101234883\"</code>&nbsp;（相邻的相同数字对是 11 和 88）不是半重复字符串。</p>\n\n<p>请你返回 <code>s</code>&nbsp;中最长 <strong>半重复</strong>&nbsp;<span data-keyword=\"substring-nonempty\">子字符串</span> 的长度。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">s = \"52233\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">4</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>最长的半重复子字符串是 \"5223\"。整个字符串 \"52233\" 有两个相邻的相同数字对 22 和 33，但最多只能选取一个。</p>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">s = \"5494\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">4</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p><code>s</code>&nbsp;是一个半重复字符串。</p>\n</div>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong><span class=\"example-io\">s = \"1111111\"</span></p>\n\n<p><strong>输出：</strong><span class=\"example-io\">2</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>最长的半重复子字符串是 \"11\"。子字符串 \"111\" 有两个相邻的相同数字对，但最多允许选取一个。</p>\n</div>\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;= 50</code></li>\n\t<li><code>'0' &lt;= s[i] &lt;= '9'</code></li>\n</ul>\n",
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                "Since n is small, we can just check every substring, and if the substring is semi-repetitive, maximize the answer with its length."
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