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+<h2><a href="https://leetcode.com/problems/merge-k-sorted-lists/">23. Merge k Sorted Lists</a></h2><h3>Hard</h3><hr><div><p>You are given an array of <code>k</code> linked-lists <code>lists</code>, each linked-list is sorted in ascending order.</p>
+
+<p><em>Merge all the linked-lists into one sorted linked-list and return it.</em></p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> lists = [[1,4,5],[1,3,4],[2,6]]
+<strong>Output:</strong> [1,1,2,3,4,4,5,6]
+<strong>Explanation:</strong> The linked-lists are:
+[
+  1-&gt;4-&gt;5,
+  1-&gt;3-&gt;4,
+  2-&gt;6
+]
+merging them into one sorted list:
+1-&gt;1-&gt;2-&gt;3-&gt;4-&gt;4-&gt;5-&gt;6
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> lists = []
+<strong>Output:</strong> []
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> lists = [[]]
+<strong>Output:</strong> []
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>k == lists.length</code></li>
+	<li><code>0 &lt;= k &lt;= 10^4</code></li>
+	<li><code>0 &lt;= lists[i].length &lt;= 500</code></li>
+	<li><code>-10^4 &lt;= lists[i][j] &lt;= 10^4</code></li>
+	<li><code>lists[i]</code> is sorted in <strong>ascending order</strong>.</li>
+	<li>The sum of <code>lists[i].length</code> won't exceed <code>10^4</code>.</li>
+</ul>
+</div>