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Populate In-Order successor in each node

Successor means next element obtained when we traverse.

So, if we keep a pointer to previously visited node, then current node is the successor.

Assuming every node has an element called successor, the code is as follows:

“prev” is a global variable here.

Can be made a function argument if desired.

Similarly, to populate any successor, we can just traverse the tree, keep a previous pointer and set that previous’ successor to the current element.

Another approach to do the same is to traverse in reverse order and set current’s successor as previous.

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