leetcode-problemset/leetcode-cn/originData/count-and-say.json

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        "question": {
            "questionId": "38",
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            "categoryTitle": "Algorithms",
            "boundTopicId": 978,
            "title": "Count and Say",
            "titleSlug": "count-and-say",
            "content": "<p>The <strong>count-and-say</strong> sequence is a sequence of digit strings defined by the recursive formula:</p>\n\n<ul>\n\t<li><code>countAndSay(1) = &quot;1&quot;</code></li>\n\t<li><code>countAndSay(n)</code> is the way you would &quot;say&quot; the digit string from <code>countAndSay(n-1)</code>, which is then converted into a different digit string.</li>\n</ul>\n\n<p>To determine how you &quot;say&quot; a digit string, split it into the <strong>minimal</strong> number of groups so that each group is a contiguous section all of the <strong>same character.</strong> Then for each group, say the number of characters, then say the character. To convert the saying into a digit string, replace the counts with a number and concatenate every saying.</p>\n\n<p>For example, the saying and conversion for digit string <code>&quot;3322251&quot;</code>:</p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/10/23/countandsay.jpg\" style=\"width: 581px; height: 172px;\" />\n<p>Given a positive integer <code>n</code>, return <em>the </em><code>n<sup>th</sup></code><em> term of the <strong>count-and-say</strong> sequence</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 1\n<strong>Output:</strong> &quot;1&quot;\n<strong>Explanation:</strong> This is the base case.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 4\n<strong>Output:</strong> &quot;1211&quot;\n<strong>Explanation:</strong>\ncountAndSay(1) = &quot;1&quot;\ncountAndSay(2) = say &quot;1&quot; = one 1 = &quot;11&quot;\ncountAndSay(3) = say &quot;11&quot; = two 1&#39;s = &quot;21&quot;\ncountAndSay(4) = say &quot;21&quot; = one 2 + one 1 = &quot;12&quot; + &quot;11&quot; = &quot;1211&quot;\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 30</code></li>\n</ul>\n",
            "translatedTitle": "外观数列",
            "translatedContent": "<p>给定一个正整数 <code>n</code> ，输出外观数列的第 <code>n</code> 项。</p>\n\n<p>「外观数列」是一个整数序列，从数字 1 开始，序列中的每一项都是对前一项的描述。</p>\n\n<p>你可以将其视作是由递归公式定义的数字字符串序列：</p>\n\n<ul>\n\t<li><code>countAndSay(1) = \"1\"</code></li>\n\t<li><code>countAndSay(n)</code> 是对 <code>countAndSay(n-1)</code> 的描述，然后转换成另一个数字字符串。</li>\n</ul>\n\n<p>前五项如下：</p>\n\n<pre>\n1.     1\n2.     11\n3.     21\n4.     1211\n5.     111221\n第一项是数字 1 \n描述前一项，这个数是 <code>1</code> 即 “ 一 个 1 ”，记作 <code>\"11\"\n</code>描述前一项，这个数是 <code>11</code> 即 “ 二 个 1 ” ，记作 <code>\"21\"\n</code>描述前一项，这个数是 <code>21</code> 即 “ 一 个 2 + 一 个 1 ” ，记作 \"<code>1211\"\n</code>描述前一项，这个数是 <code>1211</code> 即 “ 一 个 1 + 一 个 2 + 二 个 1 ” ，记作 \"<code>111221\"</code>\n</pre>\n\n<p>要 <strong>描述</strong> 一个数字字符串，首先要将字符串分割为 <strong>最小</strong> 数量的组，每个组都由连续的最多 <strong>相同字符</strong> 组成。然后对于每个组，先描述字符的数量，然后描述字符，形成一个描述组。要将描述转换为数字字符串，先将每组中的字符数量用数字替换，再将所有描述组连接起来。</p>\n\n<p>例如，数字字符串 <code>\"3322251\"</code> 的描述如下图：</p>\n<img alt=\"\" src=\"https://pic.leetcode-cn.com/1629874763-TGmKUh-image.png\" style=\"width: 581px; height: 172px;\" />\n<ul>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 1\n<strong>输出：</strong>\"1\"\n<strong>解释：</strong>这是一个基本样例。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>n = 4\n<strong>输出：</strong>\"1211\"\n<strong>解释：</strong>\ncountAndSay(1) = \"1\"\ncountAndSay(2) = 读 \"1\" = 一 个 1 = \"11\"\ncountAndSay(3) = 读 \"11\" = 二 个 1 = \"21\"\ncountAndSay(4) = 读 \"21\" = 一 个 2 + 一 个 1 = \"12\" + \"11\" = \"1211\"\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;= 30</code></li>\n</ul>\n",
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            "hints": [
                "The following are the terms from n=1 to n=10 of the count-and-say sequence:\r\n<pre>\r\n 1.     1\r\n 2.     11\r\n 3.     21\r\n 4.     1211\r\n 5.     111221 \r\n 6.     312211\r\n 7.     13112221\r\n 8.     1113213211\r\n 9.     31131211131221\r\n10.     13211311123113112211\r\n</pre>",
                "To generate the <i>n</i><sup>th</sup> term, just <i>count and say</i> the <i>n</i>-1<sup>th</sup> term."
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