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0151-reverse-words-in-a-string/README.md

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+<h2><a href="https://leetcode.com/problems/reverse-words-in-a-string/">151. Reverse Words in a String</a></h2><h3>Medium</h3><hr><div><p>Given an input string <code>s</code>, reverse the order of the <strong>words</strong>.</p>
+
+<p>A <strong>word</strong> is defined as a sequence of non-space characters. The <strong>words</strong> in <code>s</code> will be separated by at least one space.</p>
+
+<p>Return <em>a string of the words in reverse order concatenated by a single space.</em></p>
+
+<p><b>Note</b> that <code>s</code> may contain leading or trailing spaces or multiple spaces between two words. The returned string should only have a single space separating the words. Do not include any extra spaces.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre><strong>Input:</strong> s = "the sky is blue"
+<strong>Output:</strong> "blue is sky the"
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre><strong>Input:</strong> s = "  hello world  "
+<strong>Output:</strong> "world hello"
+<strong>Explanation:</strong> Your reversed string should not contain leading or trailing spaces.
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre><strong>Input:</strong> s = "a good   example"
+<strong>Output:</strong> "example good a"
+<strong>Explanation:</strong> You need to reduce multiple spaces between two words to a single space in the reversed string.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= s.length &lt;= 10<sup>4</sup></code></li>
+	<li><code>s</code> contains English letters (upper-case and lower-case), digits, and spaces <code>' '</code>.</li>
+	<li>There is <strong>at least one</strong> word in <code>s</code>.</li>
+</ul>
+
+<p>&nbsp;</p>
+<p><b data-stringify-type="bold">Follow-up:&nbsp;</b>If the string data type is mutable in your language, can&nbsp;you solve it&nbsp;<b data-stringify-type="bold">in-place</b>&nbsp;with&nbsp;<code data-stringify-type="code">O(1)</code>&nbsp;extra space?</p>
+</div>