AQA
A-level
COMPUTER SCIENCE
Paper 1
Time allowed: 2 hours 30 minutes
Materials
For this paper you must have:
• a computer
• a printer
• appropriate software
• the Electronic Answer Document
• an electronic version and a hard copy of the Skeleton Program
• an electronic ...
Time allowed: 2 hours 30
minutes
Materials
For this paper you must have:
a computer
a printer
appropriate software
the Electronic Answer Document
an electronic version and a hard copy of the Skeleton Program
an electronic version and a hard copy of the Preliminary Material
an electronic version of the Data Files game1.txt and locks.txt
You must not use a calculator.
Instructions
Type the information required on the front of your Electronic Answer Document.
Before the start of the examination make sure your Centre Number, Candidate
Name and Candidate Number are shown clearly in the footer of every page (also at
the top of the front cover) of your Electronic Answer Document.
Enter your answers into the Electronic Answer Document.
Answer all questions.
Save your work at regular intervals.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 100.
No extra time is allowed for printing and collating.
The question paper is divided into four sections.
Advice
You are advised to allocate time to each section as follows:
Section A – 40 minutes; Section B – 20 minutes; Section C – 20 minutes; Section D – 70
minutes.
At the end of the examination
Tie together all your printed Electronic Answer Document pages and hand them to the
Invigilator.
Warning
It may not be possible to issue a result for this paper if your details are not on every
page of your Electronic Answer Document.
7517/1
,[Type text]
COMP
7517/1
, 2
Section A
You are advised to spend no longer than 40 minutes on this
section. Type your answers to Section A in your Electronic
Answer Document.
You must save this document at regular intervals.
0 notation
Big-O 1 is used to express the time complexity of an algorithm. Table 1
contains a list of algorithms.
State the Big-O time complexity of each of these algorithms. The first row has
been completed for you.
Table 1
Algorithm Time complexity
Binary tree O(log n)
search
Bubble sort
Linear search
Merge sort
Copy the contents of the unshaded cells in Table 1 into the table in your
Electronic Answer Document.
[3 marks]
2
, 3
0 2 data structure can be implemented as a static data structure using an array.
A queue
0 2 .1 Describe the method that would need to be followed to attempt to
remove an item from a circular queue implemented as a static data
structure using an array.
Your method should deal appropriately with any issues which could arise.
[4 marks]
0 2 .2 Describe three differences between dynamic and static data structures.
[3 marks]
Figure 1 shows data that has been stored in a stack implemented using an
array S.
Figure 1
[7]
[6]
[5]
[4]
[3]
[2] Jib Top = 2
[1] Skye
[0] Harry
0 2 .3 What value will be returned by applying the peek
operation to S? [1 mark]
0 2 .4 What value will be returned by applying the pop
operation to S? [1 mark]
0 2 .5 Explain how a single stack can be used to reverse the order of the items in a
queue.
[2 marks]
Turn over for the next question
3
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