国外版

算法题（国外版）/find-the-difference-of-two-arrays.html

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+<p>Given two <strong>0-indexed</strong> integer arrays <code>nums1</code> and <code>nums2</code>, return <em>a list</em> <code>answer</code> <em>of size</em> <code>2</code> <em>where:</em></p>
+
+<ul>
+	<li><code>answer[0]</code> <em>is a list of all <strong>distinct</strong> integers in</em> <code>nums1</code> <em>which are <strong>not</strong> present in</em> <code>nums2</code><em>.</em></li>
+	<li><code>answer[1]</code> <em>is a list of all <strong>distinct</strong> integers in</em> <code>nums2</code> <em>which are <strong>not</strong> present in</em> <code>nums1</code>.</li>
+</ul>
+
+<p><strong>Note</strong> that the integers in the lists may be returned in <strong>any</strong> order.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums1 = [1,2,3], nums2 = [2,4,6]
+<strong>Output:</strong> [[1,3],[4,6]]
+<strong>Explanation:
+</strong>For nums1, nums1[1] = 2 is present at index 0 of nums2, whereas nums1[0] = 1 and nums1[2] = 3 are not present in nums2. Therefore, answer[0] = [1,3].
+For nums2, nums2[0] = 2 is present at index 1 of nums1, whereas nums2[1] = 4 and nums2[2] = 6 are not present in nums2. Therefore, answer[1] = [4,6].</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums1 = [1,2,3,3], nums2 = [1,1,2,2]
+<strong>Output:</strong> [[3],[]]
+<strong>Explanation:
+</strong>For nums1, nums1[2] and nums1[3] are not present in nums2. Since nums1[2] == nums1[3], their value is only included once and answer[0] = [3].
+Every integer in nums2 is present in nums1. Therefore, answer[1] = [].
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums1.length, nums2.length &lt;= 1000</code></li>
+	<li><code>-1000 &lt;= nums1[i], nums2[i] &lt;= 1000</code></li>
+</ul>