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<p>Given a binary tree, design an algorithm which creates a linked list of all the nodes at each depth (e.g., if you have a tree with depth D, you&#39;ll have D linked lists). Return a array containing all the linked lists.</p>
<p>&nbsp;</p>
<p><strong>Example: </strong></p>
<pre>
<strong>Input: </strong>[1,2,3,4,5,null,7,8]
1
/ \
2 3
/ \ \
4 5 7
/
8
<strong>Output: </strong>[[1],[2,3],[4,5,7],[8]]
</pre>