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+<h2>239. Sliding Window Maximum</h2><h3>Hard</h3><hr><div><p>You are given an array of integers&nbsp;<code>nums</code>, there is a sliding window of size <code>k</code> which is moving from the very left of the array to the very right. You can only see the <code>k</code> numbers in the window. Each time the sliding window moves right by one position.</p>
+
+<p>Return <em>the max sliding window</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> nums = [1,3,-1,-3,5,3,6,7], k = 3
+<strong>Output:</strong> [3,3,5,5,6,7]
+<strong>Explanation:</strong> 
+Window position                Max
+---------------               -----
+[1  3  -1] -3  5  3  6  7       <strong>3</strong>
+ 1 [3  -1  -3] 5  3  6  7       <strong>3</strong>
+ 1  3 [-1  -3  5] 3  6  7      <strong> 5</strong>
+ 1  3  -1 [-3  5  3] 6  7       <strong>5</strong>
+ 1  3  -1  -3 [5  3  6] 7       <strong>6</strong>
+ 1  3  -1  -3  5 [3  6  7]      <strong>7</strong>
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> nums = [1], k = 1
+<strong>Output:</strong> [1]
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> nums = [1,-1], k = 1
+<strong>Output:</strong> [1,-1]
+</pre>
+
+<p><strong>Example 4:</strong></p>
+
+<pre><strong>Input:</strong> nums = [9,11], k = 2
+<strong>Output:</strong> [11]
+</pre>
+
+<p><strong>Example 5:</strong></p>
+
+<pre><strong>Input:</strong> nums = [4,-2], k = 2
+<strong>Output:</strong> [4]
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
+	<li><code>-10<sup>4</sup> &lt;= nums[i] &lt;= 10<sup>4</sup></code></li>
+	<li><code>1 &lt;= k &lt;= nums.length</code></li>
+</ul>
+</div>