[SOLVED] Coms4032a assignment 2 binary search trees and order-statistic trees
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randomly built binary search tree on n distinct keys has expected height O(log n).In addition, you will investigate the time taken to build and destroy binary search trees.
(i) Code up the Tree-Insert and Tree-Delete algorithms from Chapter 12 of the textbook
(in C, C++ or Java).(ii) Run experiments to build binary search trees from randomly shuffled lists of keys by
repeatedly calling Tree-Insert. Record the height of each tree built. Run experiments for
different values of n (the number of keys) to illustrate the asymptotic growth of the height
as n increases. To get the ‘expected height’ of a randomly built binary search tree, repeat
the experiment a number of times for each value of n and take the average height. Plot the
growth of the avergae height of the randomly built binary search trees.(iii) For each binary search tree constructed in part (ii), record also the time taken to build
the tree and plot your results on a graph.
(iv) For each binary search tree constructed in part (ii), destroy the tree by repeatedly calling
Tree-Delete on the root node, until the tree is empty. Record the time taken to destroy
the binary search trees and plot your results on a graph.(B) In the second part of this assignment, you will code up the operations on an order-statistic
tree. The order-statistic trees will be based on binary search trees (not Red-Black Trees).
(i) Code up the Tree-Insert, Tree-Delete, OS-Search and OS-rank algorithms on a
binary search tree whose nodes are augmented with the size attribute. (Use C, C++ or Java.)
Make sure your Tree-Insert and Tree-Delete algorithms maintain the size attribute of
all nodes in the tree. Part of your assignment is to explain the changes to Tree-Insert and
Tree-Delete that are required to maintain the size attribute of the nodes.Note that there are some small changes required to OS-Search and OS-rank in the textbook since the tree is not a Red-Black tree.You must submit the following to the AA Moodle page by Sunday 6 October at 23h00:
(1) Your source code for all the algorithms in (A) and (B) (coded in C, C++ or Java).
(2) A document with:
(i) all the graphs required in (A) and a description of how the graphs were obtained (range
of dimensions, key values, number of trees of each size, etc.).
(ii) An explanation, using pseudocode and sentences, of the changes to Tree-Insert and
Tree-Delete that are required to maintain the size attribute of the nodes.