Exam (elaborations)
COS2611 EXAM PACK 2024/2025
- Institution
- University Of South Africa (Unisa)
COS2611 EXAM PACK 2024/2025 QUESTIONS WITH DETAILED ANSWERS. PERFECT FOR EXAM PREPARATION.
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lOMoAR cPSD| 18998289, lOMoAR cPSD| 18998289
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Dashboard / My courses / COS2611-23-EX10 / Welcome to the COS2611 Examination / COS2611-Exam Oct/Nov 2023
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Question 1
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Marked out of The table shows the running time against input size ( n ) of algorithm B:
2.00 What is the running complexity of algorithm B?
Algorithm n=2 n=8 n = 32
B 4 64 1024
a.O( n )
b.O(log n)
c.O(n)2
d.O(1)
Clear my choice
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, lOMoAR cPSD| 18998289
Dashboard Calendar
Dashboard / My courses / COS2611-23-EX10 / Welcome to the COS2611 Examination / COS2611-Exam Oct/Nov 2023
Question 2
Give the algorithmic complexity of the code fragment:
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for (int i = 1; i < n; i= i*2)
2.00
sum++;
a.O(log n)
b.O(n)2
c.O( n )
d.O(n log n)
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Question 3
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Marked out of Suppose an algorithm has a time complexity of O( n ) and takes 10 seconds to process an input of size 1000.
2.00
How long would it approximately take to process an input of size 200 if the input size and runtime are linearly
related?
a.20 seconds
b.5 seconds
c.2 seconds
d.None of the provided options.
e.10 seconds
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, lOMoAR cPSD| 18998289
Dashboard Calendar
Dashboard / My courses / COS2611-23-EX10 / Welcome to the COS2611 Examination / COS2611-Exam Oct/Nov 2023
Question 4
Consider the follow incomplete code. Indicate which of the following code (i) will correctly display the list of
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students in the class.
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3.00
#include <stack>
#include <string>
int main(){
std::stack<std::string> stackClass;
stackClass.push("John");
stackClass.push("Peter");
stackClass.push("Mary");
//... (i) ... missing code
}
a. while (!stackClass.empty()) {
std::cout << stackClass.top();
stackClass.pop();
}
b. for (int i=1; stackClass.top()-1;i++)
{
cout << stackClass.top();
}
c. while (!stackClass.empty()) {
stackClass.pop();
std::cout << stackClass.top();
}
d.None of the available options.
e. while (!stackClass.isEmptyStack()) {
stackClass.pop();
std::cout << stackClass.top();
}
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