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+<h2><a href="https://leetcode.com/problems/k-diff-pairs-in-an-array/">532. K-diff Pairs in an Array</a></h2><h3>Medium</h3><hr><div><p>Given an array of integers <code>nums</code> and an integer <code>k</code>, return <em>the number of <b>unique</b> k-diff pairs in the array</em>.</p>
+
+<p>A <strong>k-diff</strong> pair is an integer pair <code>(nums[i], nums[j])</code>, where the following are true:</p>
+
+<ul>
+	<li><code>0 &lt;= i &lt; j &lt; nums.length</code></li>
+	<li><code>|nums[i] - nums[j]| == k</code></li>
+</ul>
+
+<p><strong>Notice</strong> that <code>|val|</code> denotes the absolute value of <code>val</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> nums = [3,1,4,1,5], k = 2
+<strong>Output:</strong> 2
+<strong>Explanation:</strong> There are two 2-diff pairs in the array, (1, 3) and (3, 5).
+Although we have two 1s in the input, we should only return the number of <strong>unique</strong> pairs.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> nums = [1,2,3,4,5], k = 1
+<strong>Output:</strong> 4
+<strong>Explanation:</strong> There are four 1-diff pairs in the array, (1, 2), (2, 3), (3, 4) and (4, 5).
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> nums = [1,3,1,5,4], k = 0
+<strong>Output:</strong> 1
+<strong>Explanation:</strong> There is one 0-diff pair in the array, (1, 1).
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums.length &lt;= 10<sup>4</sup></code></li>
+	<li><code>-10<sup>7</sup> &lt;= nums[i] &lt;= 10<sup>7</sup></code></li>
+	<li><code>0 &lt;= k &lt;= 10<sup>7</sup></code></li>
+</ul>
+</div>