The first question is given binary tree. populate the next node for each tree node.
the node has {val, left, right, next} properties. similar to Populating Next Right Pointers in Each Node II in leetcode.

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The first question is given binary tree. populate the next node for each tree node. 
the node has {val, left, right, next} properties.  similar to Populating Next Right Pointers in Each Node II in leetcode.

Sigiloso · Accepted Answer

I used both queue solution O(n) solution and in-place solution

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