leetcode-problemset/leetcode-cn/originData/number-of-strings-which-can-be-rearranged-to-contain-substring.json

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            "questionId": "3200",
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            "categoryTitle": "Algorithms",
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            "title": "Number of Strings Which Can Be Rearranged to Contain Substring",
            "titleSlug": "number-of-strings-which-can-be-rearranged-to-contain-substring",
            "content": "<p>You are given an integer <code>n</code>.</p>\n\n<p>A string <code>s</code> is called <strong>good </strong>if it contains only lowercase English characters <strong>and</strong> it is possible to rearrange the characters of <code>s</code> such that the new string contains <code>&quot;leet&quot;</code> as a <strong>substring</strong>.</p>\n\n<p>For example:</p>\n\n<ul>\n\t<li>The string <code>&quot;lteer&quot;</code> is good because we can rearrange it to form <code>&quot;leetr&quot;</code> .</li>\n\t<li><code>&quot;letl&quot;</code> is not good because we cannot rearrange it to contain <code>&quot;leet&quot;</code> as a substring.</li>\n</ul>\n\n<p>Return <em>the <strong>total</strong> number of good strings of length </em><code>n</code>.</p>\n\n<p>Since the answer may be large, return it <strong>modulo </strong><code>10<sup>9</sup> + 7</code>.</p>\n\n<p>A <strong>substring</strong> is a contiguous sequence of characters within a string.</p>\n\n<div class=\"notranslate\" style=\"all: initial;\">&nbsp;</div>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 4\n<strong>Output:</strong> 12\n<strong>Explanation:</strong> The 12 strings which can be rearranged to have &quot;leet&quot; as a substring are: &quot;eelt&quot;, &quot;eetl&quot;, &quot;elet&quot;, &quot;elte&quot;, &quot;etel&quot;, &quot;etle&quot;, &quot;leet&quot;, &quot;lete&quot;, &quot;ltee&quot;, &quot;teel&quot;, &quot;tele&quot;, and &quot;tlee&quot;.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 10\n<strong>Output:</strong> 83943898\n<strong>Explanation:</strong> The number of strings with length 10 which can be rearranged to have &quot;leet&quot; as a substring is 526083947580. Hence the answer is 526083947580 % (10<sup>9</sup> + 7) = 83943898.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 10<sup>5</sup></code></li>\n</ul>\n",
            "translatedTitle": "重新排列后包含指定子字符串的字符串数目",
            "translatedContent": "<p>给你一个整数&nbsp;<code>n</code>&nbsp;。</p>\n\n<p>如果一个字符串&nbsp;<code>s</code>&nbsp;只包含小写英文字母，<strong>且</strong>&nbsp;将 <code>s</code>&nbsp;的字符重新排列后，新字符串包含&nbsp;<strong>子字符串</strong>&nbsp;<code>\"leet\"</code> ，那么我们称字符串 <code>s</code>&nbsp;是一个 <strong>好</strong>&nbsp;字符串。</p>\n\n<p>比方说：</p>\n\n<ul>\n\t<li>字符串&nbsp;<code>\"lteer\"</code>&nbsp;是好字符串，因为重新排列后可以得到&nbsp;<code>\"leetr\"</code>&nbsp;。</li>\n\t<li><code>\"letl\"</code>&nbsp;不是好字符串，因为无法重新排列并得到子字符串&nbsp;<code>\"leet\"</code>&nbsp;。</li>\n</ul>\n\n<p>请你返回长度为 <code>n</code>&nbsp;的好字符串 <strong>总</strong>&nbsp;数目。</p>\n\n<p>由于答案可能很大，将答案对<strong>&nbsp;</strong><code>10<sup>9</sup> + 7</code>&nbsp;<strong>取余</strong>&nbsp;后返回。</p>\n\n<p><strong>子字符串</strong>&nbsp;是一个字符串中一段连续的字符序列。</p>\n\n<div class=\"notranslate\" style=\"all: initial;\">&nbsp;</div>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>n = 4\n<b>输出：</b>12\n<b>解释：</b>总共有 12 个字符串重新排列后包含子字符串 \"leet\" ：\"eelt\" ，\"eetl\" ，\"elet\" ，\"elte\" ，\"etel\" ，\"etle\" ，\"leet\" ，\"lete\" ，\"ltee\" ，\"teel\" ，\"tele\" 和 \"tlee\" 。\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>n = 10\n<b>输出：</b>83943898\n<b>解释：</b>长度为 10 的字符串重新排列后包含子字符串 \"leet\" 的方案数为 526083947580 。所以答案为 526083947580 % (10<sup>9</sup> + 7) = 83943898 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 10<sup>5</sup></code></li>\n</ul>\n",
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