leetcode-problemset/leetcode-cn/originData/find-special-substring-of-length-k.json

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            "questionId": "3709",
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            "categoryTitle": "Algorithms",
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            "title": "Find Special Substring of Length K",
            "titleSlug": "find-special-substring-of-length-k",
            "content": "<p>You are given a string <code>s</code> and an integer <code>k</code>.</p>\n\n<p>Determine if there exists a <span data-keyword=\"substring-nonempty\">substring</span> of length <strong>exactly</strong> <code>k</code> in <code>s</code> that satisfies the following conditions:</p>\n\n<ol>\n\t<li>The substring consists of <strong>only one distinct character</strong> (e.g., <code>&quot;aaa&quot;</code> or <code>&quot;bbb&quot;</code>).</li>\n\t<li>If there is a character <strong>immediately before</strong> the substring, it must be different from the character in the substring.</li>\n\t<li>If there is a character <strong>immediately after</strong> the substring, it must also be different from the character in the substring.</li>\n</ol>\n\n<p>Return <code>true</code> if such a substring exists. Otherwise, return <code>false</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;aaabaaa&quot;, k = 3</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">true</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The substring <code>s[4..6] == &quot;aaa&quot;</code> satisfies the conditions.</p>\n\n<ul>\n\t<li>It has a length of 3.</li>\n\t<li>All characters are the same.</li>\n\t<li>The character before <code>&quot;aaa&quot;</code> is <code>&#39;b&#39;</code>, which is different from <code>&#39;a&#39;</code>.</li>\n\t<li>There is no character after <code>&quot;aaa&quot;</code>.</li>\n</ul>\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;abc&quot;, k = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">false</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>There is no substring of length 2 that consists of one distinct character and satisfies the conditions.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= k &lt;= s.length &lt;= 100</code></li>\n\t<li><code>s</code> consists of lowercase English letters only.</li>\n</ul>\n",
            "translatedTitle": "找出长度为 K 的特殊子字符串",
            "translatedContent": "<p>给你一个字符串 <code>s</code> 和一个整数 <code>k</code>。</p>\n\n<p>判断是否存在一个长度&nbsp;<strong>恰好&nbsp;</strong>为 <code>k</code> 的子字符串，该子字符串需要满足以下条件：</p>\n\n<ol>\n\t<li>该子字符串&nbsp;<strong>只包含一个唯一字符</strong>（例如，<code>\"aaa\"</code> 或 <code>\"bbb\"</code>）。</li>\n\t<li>如果该子字符串的&nbsp;<strong>前面&nbsp;</strong>有字符，则该字符必须与子字符串中的字符不同。</li>\n\t<li>如果该子字符串的&nbsp;<strong>后面&nbsp;</strong>有字符，则该字符也必须与子字符串中的字符不同。</li>\n</ol>\n\n<p>如果存在这样的子串，返回 <code>true</code>；否则，返回 <code>false</code>。</p>\n\n<p><strong>子字符串&nbsp;</strong>是字符串中的连续、非空字符序列。</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 = \"aaabaaa\", k = 3</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">true</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>子字符串 <code>s[4..6] == \"aaa\"</code> 满足条件：</p>\n\n<ul>\n\t<li>长度为 3。</li>\n\t<li>所有字符相同。</li>\n\t<li>子串 <code>\"aaa\"</code> 前的字符是 <code>'b'</code>，与 <code>'a'</code> 不同。</li>\n\t<li>子串 <code>\"aaa\"</code> 后没有字符。</li>\n</ul>\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 = \"abc\", k = 2</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">false</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>不存在长度为 2 、仅由一个唯一字符组成且满足所有条件的子字符串。</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;= k &lt;= s.length &lt;= 100</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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