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+<h2><a href="https://leetcode.com/problems/set-intersection-size-at-least-two">759. Set Intersection Size At Least Two</a></h2><h3>Hard</h3><hr><p>You are given a 2D integer array <code>intervals</code> where <code>intervals[i] = [start<sub>i</sub>, end<sub>i</sub>]</code> represents all the integers from <code>start<sub>i</sub></code> to <code>end<sub>i</sub></code> inclusively.</p>
+
+<p>A <strong>containing set</strong> is an array <code>nums</code> where each interval from <code>intervals</code> has <strong>at least two</strong> integers in <code>nums</code>.</p>
+
+<ul>
+	<li>For example, if <code>intervals = [[1,3], [3,7], [8,9]]</code>, then <code>[1,2,4,7,8,9]</code> and <code>[2,3,4,8,9]</code> are <strong>containing sets</strong>.</li>
+</ul>
+
+<p>Return <em>the minimum possible size of a containing set</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> intervals = [[1,3],[3,7],[8,9]]
+<strong>Output:</strong> 5
+<strong>Explanation:</strong> let nums = [2, 3, 4, 8, 9].
+It can be shown that there cannot be any containing array of size 4.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> intervals = [[1,3],[1,4],[2,5],[3,5]]
+<strong>Output:</strong> 3
+<strong>Explanation:</strong> let nums = [2, 3, 4].
+It can be shown that there cannot be any containing array of size 2.
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> intervals = [[1,2],[2,3],[2,4],[4,5]]
+<strong>Output:</strong> 5
+<strong>Explanation:</strong> let nums = [1, 2, 3, 4, 5].
+It can be shown that there cannot be any containing array of size 4.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= intervals.length &lt;= 3000</code></li>
+	<li><code>intervals[i].length == 2</code></li>
+	<li><code>0 &lt;= start<sub>i</sub> &lt; end<sub>i</sub> &lt;= 10<sup>8</sup></code></li>
+</ul>