The questions of Test_2

with two model answers - one correct (yes) and one incorrect (no)


Mark the correct and incorrect definitions and assertions about trees.
(yes) If node u is the parent of node v, we say that v is a child of u.
(no) Nodes that are children of the same parent are called leaves.

Let us have a tree ADT with n elements. Let v and w be positions in the tree. Mark the correct/incorrect correspondence between a function of this ADT and its run-time assumptions.
(yes) root(v) - O(1)
(no) parent(v) - O(n)

Let us have an ordered tree ADT in parenthetic string representation T=A(B(H,E(I,J),F),C(G),D). Determine the correct/incorrect pairs: function, its output value. p(X) means the position of the element X. [Hint: See p.268 for "parenthetic string representation".]
(yes) root(), p(A)
(no) root(), p(D)

Let us have an ordered tree ADT in parenthetic string representation T=A(B(H,E(I,J),F),C(G),D). Is the given sequence a part of the sequence of nodes, obtained in preorder traversal of the tree?
(yes) ABH
(no) EB

Let us have an ordered tree ADT in parenthetic string representation T=A(B(H,E(I,J),F),C(G),D). Is the given sequence a part of the sequence of nodes, obtained in postorder traversal of the tree?
(yes) HIJ
(no) EB

Let us have a binary tree ADT in parenthetic string representation T=a(b(d(h,i),e),c(f,g(j(l,m),k)). Is the given sequence a part of the sequence of nodes, obtained in inorder traversal of this binary tree?
(yes) hdib
(no) hdie

Let us have a binary tree ADT in parenthetic string representation T=a(b(d(h,i),e),c(f,g(j(l,m),k)). Is the given sequence a part of the sequence of nodes, obtained in Euler tour traversal of this binary tree.
(yes) abdhd
(no) bdhid

Create a binary tree representation of the following arithmetic expression: (9 * (5 + a) + b) / 2. Is the given sequence a part of the sequence of nodes, obtained in preorder traversal of this binary tree. [Hint: See p.258, Example 6.5.]
(yes) /+*
(no) 9/2

Create a binary tree representation of the following arithmetic expression: (9 * (5 + a) + b) / 2. Is the given sequence a part of the postorder traversal sequence of this binary tree.
(yes) 95a
(no) 9/2

Mark the correct/incorrect definitions and assertions about priority queues and heaps.
(yes) A key is an object that is assigned to an element as a specific attribute for that element and that can be used to identify, rank, or weight that element.
(no) In a heap storing n keys, upheap (bubbling) algorithm runs O(n) time.

Let us have a priority queue ADT with n elements implementation with an unsorted sequence. Mark the correct/incorrect correspondence between a function of this ADT and its performance.
(yes) minElement() - O(n)
(no) minKey() - O(1)

Let us have a priority queue ADT P={(5,A),(7,D),(9,C)}. For a function of this ADT determine the return value and its effect on P.
(yes) insertItem(3,B)-NONE-{(3,B),(5,A),(7,D),(9,C)}
(no) minElement()-5-{(5,A),(7,D),(9,C)}

Let us have a priority queue ADT with n elements implementation with a sorted sequence. Mark the correct/incorrect correspondence between a function of this ADT and its performance.
(yes) minElement() - O(1)
(no) minElement() - O(n)

Let us have a priority queue ADT with n elements for the heap implementation. Mark the correct/incorrect correspondence between a function of this ADT and its performance.
(yes) minElement() - O(1)
(no) minElement() - O(n)

A simple way of realizing a dictionary is to use an unordered vector, list, or general sequence to store the key-element pairs. Such an implementation is called a log file. Mark the correct/incorrect correspondence between a function of this realization of dictionary ADT and its performance.
(yes) size() - O(1)
(no) insertItem(k,e) - O(n)

Mark the correct and incorrect definitions and assertions about the dictionary ADT.
(yes) A dictionary ADT stores key-element pairs (k,e) which we call items, where k is the key and e is the element.
(no) Keys in a dictionary can be arbitrary objects on which a total order must be defined.

Let us have a dictionary ADT D={(7,B),(2,C),(2,E)}. For a function of this ADT determine the return value and its effect on P. The notation p(X) indicates the position of the item storing element X.
(yes) insertItem(8,A)-NONE-{(7,B),(2,C),(2,E),(8,A)}
(no) find(B)-p(7)-{(7,B),(2,C),(2,E)}