Page 82 Concepts and similar pages

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85 Unfortunately,in many applications one wants the ability to insert a key which has been found to be absent ...The structure of the tree as it grows is largely dependent on the order in which new keys are presented ...It would take us too far afield for me to explain the techniques for avoiding degenerate trees ...
84 eventually terminate at a particular node from which no further branches will emerge ...By now it is perhaps apparent that when we were talking about ring structures and threaded lists in some of our examples we were really demonstrating how to implement a tree structure ...Another example of a tree structure is the directory associated with an index sequential file ...The use of tree structures in computer science dates back to the early 1950 s when it was realised that the so called binary search could readily be represented by a binary tree ...