leetcode-problemset/leetcode-cn/originData/find-longest-special-substring-that-occurs-thrice-i.json

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            "title": "Find Longest Special Substring That Occurs Thrice I",
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            "content": "<p>You are given a string <code>s</code> that consists of lowercase English letters.</p>\n\n<p>A string is called <strong>special</strong> if it is made up of only a single character. For example, the string <code>&quot;abc&quot;</code> is not special, whereas the strings <code>&quot;ddd&quot;</code>, <code>&quot;zz&quot;</code>, and <code>&quot;f&quot;</code> are special.</p>\n\n<p>Return <em>the length of the <strong>longest special substring</strong> of </em><code>s</code> <em>which occurs <strong>at least thrice</strong></em>, <em>or </em><code>-1</code><em> if no special substring occurs at least thrice</em>.</p>\n\n<p>A <strong>substring</strong> is a contiguous <strong>non-empty</strong> sequence of characters within a string.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aaaa&quot;\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> The longest special substring which occurs thrice is &quot;aa&quot;: substrings &quot;<u><strong>aa</strong></u>aa&quot;, &quot;a<u><strong>aa</strong></u>a&quot;, and &quot;aa<u><strong>aa</strong></u>&quot;.\nIt can be shown that the maximum length achievable is 2.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;abcdef&quot;\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> There exists no special substring which occurs at least thrice. Hence return -1.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;abcaba&quot;\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> The longest special substring which occurs thrice is &quot;a&quot;: substrings &quot;<u><strong>a</strong></u>bcaba&quot;, &quot;abc<u><strong>a</strong></u>ba&quot;, and &quot;abcab<u><strong>a</strong></u>&quot;.\nIt can be shown that the maximum length achievable is 1.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>3 &lt;= s.length &lt;= 50</code></li>\n\t<li><code>s</code> consists of only lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "找出出现至少三次的最长特殊子字符串 I",
            "translatedContent": "<p>给你一个仅由小写英文字母组成的字符串 <code>s</code> 。</p>\n\n<p>如果一个字符串仅由单一字符组成，那么它被称为 <strong>特殊 </strong>字符串。例如，字符串 <code>\"abc\"</code> 不是特殊字符串，而字符串 <code>\"ddd\"</code>、<code>\"zz\"</code> 和 <code>\"f\"</code> 是特殊字符串。</p>\n\n<p>返回在 <code>s</code> 中出现 <strong>至少三次 </strong>的<strong> 最长特殊子字符串 </strong>的长度，如果不存在出现至少三次的特殊子字符串，则返回 <code>-1</code> 。</p>\n\n<p><strong>子字符串 </strong>是字符串中的一个连续<strong> 非空 </strong>字符序列。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"aaaa\"\n<strong>输出：</strong>2\n<strong>解释：</strong>出现三次的最长特殊子字符串是 \"aa\" ：子字符串 \"<em><strong>aa</strong></em>aa\"、\"a<em><strong>aa</strong></em>a\" 和 \"aa<em><strong>aa</strong></em>\"。\n可以证明最大长度是 2 。\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"abcdef\"\n<strong>输出：</strong>-1\n<strong>解释：</strong>不存在出现至少三次的特殊子字符串。因此返回 -1 。\n</pre>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"abcaba\"\n<strong>输出：</strong>1\n<strong>解释：</strong>出现三次的最长特殊子字符串是 \"a\" ：子字符串 \"<em><strong>a</strong></em>bcaba\"、\"abc<em><strong>a</strong></em>ba\" 和 \"abcab<em><strong>a</strong></em>\"。\n可以证明最大长度是 1 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>3 &lt;= s.length &lt;= 50</code></li>\n\t<li><code>s</code> 仅由小写英文字母组成。</li>\n</ul>\n",
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