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0978-valid-mountain-array/README.md

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+<h2><a href="https://leetcode.com/problems/valid-mountain-array">978. Valid Mountain Array</a></h2><h3>Easy</h3><hr><p>Given an array of integers <code>arr</code>, return <em><code>true</code> if and only if it is a valid mountain array</em>.</p>
+
+<p>Recall that arr is a mountain array if and only if:</p>
+
+<ul>
+	<li><code>arr.length &gt;= 3</code></li>
+	<li>There exists some <code>i</code> with <code>0 &lt; i &lt; arr.length - 1</code> such that:
+	<ul>
+		<li><code>arr[0] &lt; arr[1] &lt; ... &lt; arr[i - 1] &lt; arr[i] </code></li>
+		<li><code>arr[i] &gt; arr[i + 1] &gt; ... &gt; arr[arr.length - 1]</code></li>
+	</ul>
+	</li>
+</ul>
+<img src="https://assets.leetcode.com/uploads/2019/10/20/hint_valid_mountain_array.png" width="500" />
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<pre><strong>Input:</strong> arr = [2,1]
+<strong>Output:</strong> false
+</pre><p><strong class="example">Example 2:</strong></p>
+<pre><strong>Input:</strong> arr = [3,5,5]
+<strong>Output:</strong> false
+</pre><p><strong class="example">Example 3:</strong></p>
+<pre><strong>Input:</strong> arr = [0,3,2,1]
+<strong>Output:</strong> true
+</pre>
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= arr.length &lt;= 10<sup>4</sup></code></li>
+	<li><code>0 &lt;= arr[i] &lt;= 10<sup>4</sup></code></li>
+</ul>