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350-intersection-of-two-arrays-ii/README.md

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+<h2><a href="https://leetcode.com/problems/intersection-of-two-arrays-ii/">350. Intersection of Two Arrays II</a></h2><h3>Easy</h3><hr><div><p>Given two integer arrays <code>nums1</code> and <code>nums2</code>, return <em>an array of their intersection</em>. Each element in the result must appear as many times as it shows in both arrays and you may return the result in <strong>any order</strong>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> nums1 = [1,2,2,1], nums2 = [2,2]
+<strong>Output:</strong> [2,2]
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> nums1 = [4,9,5], nums2 = [9,4,9,8,4]
+<strong>Output:</strong> [4,9]
+<strong>Explanation:</strong> [9,4] is also accepted.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums1.length, nums2.length &lt;= 1000</code></li>
+	<li><code>0 &lt;= nums1[i], nums2[i] &lt;= 1000</code></li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Follow up:</strong></p>
+
+<ul>
+	<li>What if the given array is already sorted? How would you optimize your algorithm?</li>
+	<li>What if <code>nums1</code>'s size is small compared to <code>nums2</code>'s size? Which algorithm is better?</li>
+	<li>What if elements of <code>nums2</code> are stored on disk, and the memory is limited such that you cannot load all elements into the memory at once?</li>
+</ul>
+</div>