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Programming Part:

1. Add the following methods1
to the List class:

(a) The copy constructor, List( const List & rhs ). This method must take O(n) time.

(b) The method front( ). It performs as stated in
www.cplusplus.com/reference/forward_list/forward_list/front/ This method must take O(1) time.

(c) The method merge( List & alist). It performs as stated in

(d) The method remove adjacent duplicates( ). The method removes any element if it is adjacent to a node
containing the same item2

. Thus if the list contained a, a, a, b, b, c, c, c, c afterwards it would contain a, b, c. If
the list contains a, b, a, b, a then afterwards it contains a, b, a, b, a (i.e. no change, since no items adjacent to
each other were the same).

(e) The method insert after( iterator pos, Object && x) which moves x into a new node which is located
after pos. Your method must run in O(1) time.

(f) The method remove if( Predicate pred ) that performs as stated in
www.cplusplus.com/reference/forward_list/forward_list/remove_if/ This method must run in O(n)
time. Your method should call your method erase after.

A simplified version of the List class is in a file simple-list.cpp. We will test your code by including it in
a driver program that uses the methods you implemented. You must test your code by writing and executing
your own driver. Remember to hand in your driver code for any programming assignment.

2. Efficiently implement3 a queue class called Queue using a singly linked lists, with no header node or tail node(i.e.
nodes that contain no data). Your class should have the methods: front, back, empty, enqueue, dequeue.

3. (Extra Credit) Suppose that a doubly linked list class, Dlist is implemented with both a head and a tail node.
Write a method4
to remove all nodes containing x.
void DList::remove(const Object & x)
A simplified version of the DList class is in a file simple-doubly-linked-list.cpp.

∗10% extra credit will be given if you turn this assignment in on Sunday March 20 at 11:00 p.m.
1Do written question 2 before this question in order to get experience writing pseudo code.
If the list was sorted, the list would remove all duplicates.
3Please do written question 7 first.

4The erase method is not included in the simplified doubly linked list class I uploaded. I did not include it so you would get to practice
working with pointers for a doubly linked list class. You may write your own erase method.

Written Part:

1. Draw the conceptual representation for our implementation of a link list (include the header) containing a single
item A.

2. For the programming questions in 1 (except 1a)
• draw pictures showing how the links change (or don’t change) for programming questions
• provide the pseudo code for the methods

3. For each of the following, determine if the iterator is valid.
vector A = {1,2,3,4,5};
vector B;
vector::iterator vItr;
list C = {1, 2,3,4,5};
list D;
list::iterator lItr;
(a) B = A;
vItr = B.begin();
(b) B = A;
vItr = B.begin()+2;
(c) D = C;
lItr = C.begin();
(d) D = C;
lItr = ++D.begin();

4. Which of the following code snippets are valid? If the code snippet is invalid, state why.
(a) list l;
list::iterator lIter;
lIter = l.begin();
for (int i = 1; i < 100; ++i)
for (int i = 1; i < 100; ++i)
cout << *lIter << endl;
(b) list l;
list::iterator lIter1;
list::iterator lIter2;
list::iterator mid;
for (int i = 0; i < 100; ++i)
lIter1 = l.begin();
lIter2 = l.end();
mid = lIter1 + (lIter2 – lIter1)/2;
cout << *mid << endl;
(c) vector v;
vector::iterator vIter1;
vector::iterator vIter2;
vector::iterator mid;
for (int i = 0; i < 100; ++i)
vIter1 = v.begin();
vIter2 = v.end();
mid = vIter1 + (vIter2 – vIter1)/2;
cout << *mid << endl;

5. For the List class, what if the following code for the method remove was used. Would it work correctly? Explain. void remove( const Object & x ) { Node * prev = header->next;
while ( prev != nullptr )
if ( prev->next->data == x )
erase_after( iterator(prev) );
prev = prev->next;

6. For the linked list implementation of the ADT stack, show the conceptual representation of the contents of the
stack for each line of code below:
Stack s;

7. For your linked list implementation of the ADT queue, show the conceptual representation of the contents of the
stack for each line of code below:
Queue q;