My Own Notes: Sink Zeros in Binary Tree



My Own Notes: Sink Zeros in Binary Tree

 Swap zero value of a node with non-zero value of one of its descendants so that no node with value zero could be parent of node with non-zero.

Solution: 

We use a postorder traversal of the tree where instead of sinking we rise the leafs, we keep the nodes that we are sure that have not a zero ancestor.

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