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448-find-all-numbers-disappeared-in-an-array/README.md

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+<h2><a href="https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/">448. Find All Numbers Disappeared in an Array</a></h2><h3>Easy</h3><hr><div><p>Given an array <code>nums</code> of <code>n</code> integers where <code>nums[i]</code> is in the range <code>[1, n]</code>, return <em>an array of all the integers in the range</em> <code>[1, n]</code> <em>that do not appear in</em> <code>nums</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+<pre><strong>Input:</strong> nums = [4,3,2,7,8,2,3,1]
+<strong>Output:</strong> [5,6]
+</pre><p><strong>Example 2:</strong></p>
+<pre><strong>Input:</strong> nums = [1,1]
+<strong>Output:</strong> [2]
+</pre>
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>n == nums.length</code></li>
+	<li><code>1 &lt;= n &lt;= 10<sup>5</sup></code></li>
+	<li><code>1 &lt;= nums[i] &lt;= n</code></li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Follow up:</strong> Could you do it without extra space and in <code>O(n)</code> runtime? You may assume the returned list does not count as extra space.</p>
+</div>