merge-nodes-in-between-zeros

Merge Nodes in Between Zeros

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mergeNodes

You are given the <code>head</code> of a linked list, which contains a series of integers separated by <code>0</code>&#39;s. The beginning and end of the linked list will have <code>Node.val == 0</code>.

For every two consecutive <code>0</code>&#39;s, merge all the nodes lying in between them into a single node whose value is the sum of all the merged nodes. The modified list should not contain any <code>0</code>&#39;s.

Return the <code>head</code> of the modified linked list.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2022/02/02/ex1-1.png" style="width: 600px; height: 41px;" />
<pre>
Input: head = [0,3,1,0,4,5,2,0]
Output: [4,11]
Explanation: 
The above figure represents the given linked list. The modified list contains
- The sum of the nodes marked in green: 3 + 1 = 4.
- The sum of the nodes marked in red: 4 + 5 + 2 = 11.
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2022/02/02/ex2-1.png" style="width: 600px; height: 41px;" />
<pre>
Input: head = [0,1,0,3,0,2,2,0]
Output: [1,3,4]
Explanation: 
The above figure represents the given linked list. The modified list contains
- The sum of the nodes marked in green: 1 = 1.
- The sum of the nodes marked in red: 3 = 3.
- The sum of the nodes marked in yellow: 2 + 2 = 4.
</pre>

&nbsp;
Constraints:

<ul>
	<li>The number of nodes in the list is in the range <code>[3, 2 * 105]</code>.</li>
	<li><code>0 &lt;= Node.val &lt;= 1000</code></li>
	<li>There are no two consecutive nodes with <code>Node.val == 0</code>.</li>
	<li>The beginning and end of the linked list have <code>Node.val == 0</code>.</li>
</ul>

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