Serialize And Deserialize A Given N-Ary Tree

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Binary trees can be represented as arrays, as opposed to Nodes with references to children. In such a representation, the root of the tree is located at index 0 of the array. Descending from the root downwards, the left child of a node is stored in the array at index ((2. current node's index) + 1), and its right child is mapped to ((2. current node's index)) + 2). To serialize the Tree, map it to an array and then serialize the array. To unserialize, use element 0 as the root, and use the formulas above to restore the left and right children for each node.

Thus, given a tree with height H, create an array of size 2^H. Insert the root at location 0, then its left child at location ((2. 0) +1) and it's right child at ((2. 0)+2).

As you descend towards the leaves, repeat the process. Orr May 20, 2011. When we say serialize and de-serialize what do we mean??

C# Binaryformatter Deserialize

Serialize And Deserialize A Given N-Ary Tree

We are trying to save the data contained in the node of binary tree on secondary storage in a manner so that same data with same structure can be retrieved. The key(data) in the node of binary tree could be a pointer (e.g. Pointer to character array) or double pointer. So to serialize/de-serialize we must know the structure of node of binary tree, structure of serialized data and data pointed by some pointer in the node or the data (if not pointer) contained in the node. Now come to the question: We can serialize the binary tree by saving the data in pre/post + in order traversal on secondary storage. For de-serialization we can easily build the binary tree by using these two traversal. Also we can do it as posted by Orr but it will consume lot of space which is useless (saving the NULLs, consider completely skewed tree) but we can afford it because secondary storage is cheap:) I hope I am clear.

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Any comments are welcome. Googler May 20, 2011. I guess for a small tree, with lesser number of levels, the Array Storage method is really good.

It does wastes some space if the tree is not complete, but is very simple and straightforward. By the way, this can be easily extended to n-way trees, by calculating indices of children in the array by multiplication with n, instead of 2 i.e., children of node at index i would be at (n.i +1), (n.i +2).

Serialize And Deserialize Bst

The In-order storage along with any of the Pre-order/Post-Order is slightly complex during reconstruction, but is a great space saver, specially with trees with high depths. Saurabh July 16, 2011.

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