99 Elm Problems/Problem 63

Construct a complete binary tree.

A complete binary tree with height H is defined as follows:

The levels 1,2,3,...,H-1 contain the maximum number of nodes.

In level H, which may contain less than the maximum possible number of nodes, all the nodes are "left-adjusted". This means that in a level-order tree traversal all internal nodes come first, the leaves come second, and empty successors come last.

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Example in Elm:

Result:

Solutions