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0038-count-and-say/README.md

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+<h2><a href="https://leetcode.com/problems/count-and-say">38. Count and Saya>h2><h3>Mediumh3><hr><p>The <strong>count-and-saystrong> sequence is a sequence of digit strings defined by the recursive formula:p>
+
+<ul>
+	countAndSay(1) = "1"
+	countAndSay(n) is the run-length encoding of countAndSay(n - 1).
+ul>
+
+<p><a href="http://en.wikipedia.org/wiki/Run-length_encoding" target="_blank">Run-length encodinga> (RLE) is a string compression method that works by replacing consecutive identical characters (repeated 2 or more times) with the concatenation of the character and the number marking the count of the characters (length of the run). For example, to compress the string <code>&quot;3322251&quot;code> we replace <code>&quot;33&quot;code> with <code>&quot;23&quot;code>, replace <code>&quot;222&quot;code> with <code>&quot;32&quot;code>, replace <code>&quot;5&quot;code> with <code>&quot;15&quot;code> and replace <code>&quot;1&quot;code> with <code>&quot;11&quot;code>. Thus the compressed string becomes <code>&quot;23321511&quot;code>.p>
+
+<p>Given a positive integer <code>ncode>, return <em>the em><code>n<sup>thsup>code><em> element of the <strong>count-and-saystrong> sequenceem>.p>
+
+<p>&nbsp;p>
+<p><strong class="example">Example 1:strong>p>
+
+<div class="example-block">
+<p><strong>Input:strong> <span class="example-io">n = 4span>p>
+
+<p><strong>Output:strong> <span class="example-io">&quot;1211&quot;span>p>
+
+<p><strong>Explanation:strong>p>
+
+<pre>
+countAndSay(1) = &quot;1&quot;
+countAndSay(2) = RLE of &quot;1&quot; = &quot;11&quot;
+countAndSay(3) = RLE of &quot;11&quot; = &quot;21&quot;
+countAndSay(4) = RLE of &quot;21&quot; = &quot;1211&quot;
+pre>
+div>
+
+<p><strong class="example">Example 2:strong>p>
+
+<div class="example-block">
+<p><strong>Input:strong> <span class="example-io">n = 1span>p>
+
+<p><strong>Output:strong> <span class="example-io">&quot;1&quot;span>p>
+
+<p><strong>Explanation:strong>p>
+
+<p>This is the base case.p>
+div>
+
+<p>&nbsp;p>
+<p><strong>Constraints:strong>p>
+
+<ul>
+	1 <= n <= 30
+ul>
+
+<p>&nbsp;p>
+<strong>Follow up:strong> Could you solve it iteratively?