Example Tree
2 -> root
1 -> Left
3 -> right
stored in array in in order [1, 2, 3]
How to retrieve the root node knowing that the tree is stored in inorder?
According to me all three as possible candidates of root node.
Indeed all 3 are possible candidates.
Here are possible trees that would result in the given in-order traversal:
1 2 3
\ / \ /
2 1 3 2
\ /
3 1
An in-order traversal isn't necessarily sufficient to uniquely identify a tree (and thus consistently identify the root). Assuming unique tree elements, you need either a pre-order or post-order traversal paired with an in-order traversal.
Reference - Which combinations of pre-, post- and in-order sequentialisation are unique?
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