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+<h2><a href="https://leetcode.com/problems/set-mismatch/">645. Set Mismatch</a></h2><h3>Easy</h3><hr><div><p>You have a set of integers <code>s</code>, which originally contains all the numbers from <code>1</code> to <code>n</code>. Unfortunately, due to some error, one of the numbers in <code>s</code> got duplicated to another number in the set, which results in <strong>repetition of one</strong> number and <strong>loss of another</strong> number.</p>
+
+<p>You are given an integer array <code>nums</code> representing the data status of this set after the error.</p>
+
+<p>Find the number that occurs twice and the number that is missing and return <em>them in the form of an array</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<pre><strong>Input:</strong> nums = [1,2,2,4]
+<strong>Output:</strong> [2,3]
+</pre><p><strong class="example">Example 2:</strong></p>
+<pre><strong>Input:</strong> nums = [1,1]
+<strong>Output:</strong> [1,2]
+</pre>
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>2 &lt;= nums.length &lt;= 10<sup>4</sup></code></li>
+	<li><code>1 &lt;= nums[i] &lt;= 10<sup>4</sup></code></li>
+</ul>
+</div>