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Difficulty: Medium/Merge K sorted linked lists/README.md

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+<h2><a href="https://www.geeksforgeeks.org/problems/merge-k-sorted-linked-lists/1">Merge K sorted linked lists</a></h2><h3>Difficulty Level : Difficulty: Medium</h3><hr><div class="problems_problem_content__Xm_eO"><p><span style="font-size: 18px;">Given an array <strong>arr[] </strong>of <strong>n</strong> <strong>sorted linked lists</strong> of different sizes. The task is to <strong>merge</strong> them in such a way that after merging they will be a <strong>single sorted</strong> linked list, then <strong>return </strong>the<strong> head</strong> of the merged linked list.</span></p>
+<p><span style="font-size: 18px;"><strong>Examples:</strong></span></p>
+<pre><span style="font-size: 18px;"><strong>Input: </strong>arr[] = [1 -&gt; 2 -&gt; 3, 4 -&gt; 5, 5 -&gt; 6, 7 -&gt; 8]
+<strong>Output: </strong>1 -&gt; 2 -&gt; 3 -&gt; 4 -&gt; 5 -&gt; 5 -&gt; 6 -&gt; 7 -&gt; 8<strong>
+Explanation:<br></strong>The arr[] has 4 sorted linked list of size 3, 2, 2, 2.
+1st list: 1 -&gt; 2-&gt; 3
+2nd list: 4 -&gt; 5
+3rd list: 5 -&gt; 6
+4th list: 7 -&gt; 8
+The merged list will be:
+</span><img src="https://media.geeksforgeeks.org/img-practice/prod/addEditProblem/700265/Web/Other/blobid0_1737094930.png" width="388" height="68"> </pre>
+<pre><span style="font-size: 18px;"><strong>Input: </strong>arr[] = [1 -&gt; 3, 8, 4 -&gt; 5 -&gt; 6]
+<strong>Output: </strong>1 -&gt; 3 -&gt; 4 -&gt; 5 -&gt; 6 -&gt; 8<strong>
+Explanation:<br></strong>The arr[] has 3 sorted linked list of size 2, 3, 1.
+1st list: 1 -&gt; 3
+2nd list: 8
+3rd list: 4 -&gt; 5 -&gt; 6
+The merged list will be:<br><img src="https://media.geeksforgeeks.org/img-practice/prod/addEditProblem/700265/Web/Other/blobid1_1722513386.png" width="400" height="70"></span>
+</pre>
+<p><span style="font-size: 18px;"><strong>Constraints</strong><br>1 &lt;= total no. of nodes &lt;= 10<sup>5</sup><sup><br></sup>1 &lt;= node-&gt;data &lt;= 10<sup>3</sup></span></p></div><p><span style=font-size:18px><strong>Company Tags : </strong><br><code>VMWare</code>&nbsp;<code>Amazon</code>&nbsp;<code>Microsoft</code>&nbsp;<code>Oracle</code>&nbsp;<br><p><span style=font-size:18px><strong>Topic Tags : </strong><br><code>Linked List</code>&nbsp;<code>Heap</code>&nbsp;<code>Data Structures</code>&nbsp;