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leetcode-problemset/leetcode/problem/longest-turbulent-subarray.html

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<p>Given an integer array <code>arr</code>, return <em>the length of a maximum size turbulent subarray of</em> <code>arr</code>.</p>
<p>A subarray is <strong>turbulent</strong> if the comparison sign flips between each adjacent pair of elements in the subarray.</p>
<p>More formally, a subarray <code>[arr[i], arr[i + 1], ..., arr[j]]</code> of <code>arr</code> is said to be turbulent if and only if:</p>
<ul>
<li>For <code>i &lt;= k &lt; j</code>:
<ul>
<li><code>arr[k] &gt; arr[k + 1]</code> when <code>k</code> is odd, and</li>
<li><code>arr[k] &lt; arr[k + 1]</code> when <code>k</code> is even.</li>
</ul>
</li>
<li>Or, for <code>i &lt;= k &lt; j</code>:
<ul>
<li><code>arr[k] &gt; arr[k + 1]</code> when <code>k</code> is even, and</li>
<li><code>arr[k] &lt; arr[k + 1]</code> when <code>k</code> is odd.</li>
</ul>
</li>
</ul>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input:</strong> arr = [9,4,2,10,7,8,8,1,9]
<strong>Output:</strong> 5
<strong>Explanation:</strong> arr[1] &gt; arr[2] &lt; arr[3] &gt; arr[4] &lt; arr[5]
</pre>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> arr = [4,8,12,16]
<strong>Output:</strong> 2
</pre>
<p><strong class="example">Example 3:</strong></p>
<pre>
<strong>Input:</strong> arr = [100]
<strong>Output:</strong> 1
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= arr.length &lt;= 4 * 10<sup>4</sup></code></li>
<li><code>0 &lt;= arr[i] &lt;= 10<sup>9</sup></code></li>
</ul>