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leetcode/problem/uncrossed-lines.html

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+<p>You are given two integer arrays <code>nums1</code> and <code>nums2</code>. We write the integers of <code>nums1</code> and <code>nums2</code> (in the order they are given) on two separate horizontal lines.</p>
+
+<p>We may draw connecting lines: a straight line connecting two numbers <code>nums1[i]</code> and <code>nums2[j]</code> such that:</p>
+
+<ul>
+	<li><code>nums1[i] == nums2[j]</code>, and</li>
+	<li>the line we draw does not intersect any other connecting (non-horizontal) line.</li>
+</ul>
+
+<p>Note that a connecting line cannot intersect even at the endpoints (i.e., each number can only belong to one connecting line).</p>
+
+<p>Return <em>the maximum number of connecting lines we can draw in this way</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2019/04/26/142.png" style="width: 400px; height: 286px;" />
+<pre>
+<strong>Input:</strong> nums1 = [1,4,2], nums2 = [1,2,4]
+<strong>Output:</strong> 2
+<strong>Explanation:</strong> We can draw 2 uncrossed lines as in the diagram.
+We cannot draw 3 uncrossed lines, because the line from nums1[1] = 4 to nums2[2] = 4 will intersect the line from nums1[2]=2 to nums2[1]=2.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums1 = [2,5,1,2,5], nums2 = [10,5,2,1,5,2]
+<strong>Output:</strong> 3
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums1 = [1,3,7,1,7,5], nums2 = [1,9,2,5,1]
+<strong>Output:</strong> 2
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums1.length, nums2.length &lt;= 500</code></li>
+	<li><code>1 &lt;= nums1[i], nums2[j] &lt;= 2000</code></li>
+</ul>