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C++ Institute CPP Exam - Topic 2 Question 77 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 77
Topic #: 2
[All CPP Questions]

Which are NOT valid instantiations of priority_queue object:

#include

#include

#include

#include

#include

using namespace std;

int main()

{

deque mydeck;list mylist; vector myvector;

priority_queue first;//line I

priority_queue > second;//line II

priority_queue third(first);//line III

priority_queue > fourth(third);//line IV

priority_queue > fifth(myvector.begin(), myvector.end());//line V

return 0;

}

Show Suggested Answer Hide Answer
Suggested Answer: E

by Colette at Jan 27, 2024, 10:52 PM

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Caprice
3 months ago
Definitely line IV, lists can't be used like that!
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Carri
4 months ago
Wait, can you really use a list in a priority_queue?
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Quentin
4 months ago
Line II is good too, deque works with priority_queue.
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Tambra
4 months ago
I think line IV is the one that's not valid.
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Brigette
4 months ago
Line III is valid, just a copy constructor.
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Lettie
5 months ago
I practiced a similar question, and I think line V is fine because it uses a vector, which is a valid underlying container for a priority queue.
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Avery
5 months ago
Line IV seems off to me; I don't recall if you can instantiate a priority queue with another priority queue as a parameter.
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Carmelina
5 months ago
I remember something about the container types for priority queues, and I feel like line II is valid since deque is one of the allowed types.
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Rosio
5 months ago
I think line III might be problematic because it looks like it's trying to copy a priority queue, but I'm not sure if that's allowed.
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Erin
5 months ago
This looks like a tricky question, but I think I can figure it out. I'll need to carefully consider the valid container types for priority_queue and how they interact with the provided examples.
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Bulah
5 months ago
I'm a bit confused by the different container types being used here. I'll need to refresh my memory on the requirements for the priority_queue constructor and make sure I understand the differences between these containers.
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Christa
5 months ago
I think I know the answer to this one. The priority_queue container requires a specific type of underlying container, and not all of these options are valid. I'll need to double-check the details, but I'm feeling confident about this.
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Alton
5 months ago
Okay, let me see. The first line seems straightforward, but the others might have some restrictions I'm not sure about. I'll have to review the priority_queue documentation to be sure.
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Lashawna
5 months ago
Hmm, this looks tricky. I'll need to carefully read through the code and think about the requirements for a valid priority_queue instantiation.
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Bong
5 months ago
This question seems straightforward, I'm pretty confident I can figure it out.
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Winifred
5 months ago
I think the key here is to focus on the idea of consistency. Consistent service means treating all customers the same way, so the priority assignment should be based on a standardized agreement, not individual factors. I'm leaning towards option C, but I'll double-check the other choices just to be sure.
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Zack
5 months ago
I'm torn between A and B because it could be tricky. Were there some conditions in the script that might lead to only nine objects being created instead?
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Malcom
10 months ago
I'm pretty sure all the other lines are valid instantiations. Line IV is the only one that doesn't work. Now, if they asked me to instantiate a priority_queue with a banana, that would be a different story!
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Shawnda
8 months ago
I agree with you, line IV is the only one that doesn't work. The rest are valid instantiations.
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Mary
8 months ago
No, I'm pretty confident that line II is valid. It's line IV that doesn't work.
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Stephaine
8 months ago
Are you sure about that? I think line II is also not a valid instantiation.
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Timothy
8 months ago
E) line V
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Antonio
8 months ago
D) line IV
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Raina
8 months ago
C) line III
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Margarita
8 months ago
B) line II
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Mattie
8 months ago
A) line I
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Cyril
11 months ago
Haha, it's funny how they try to trick us with a list. Who uses a list for a priority queue? That's like trying to use a toaster to dry your hair!
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Eun
9 months ago
It's like using a toaster to dry your hair, totally useless!
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Lavonne
9 months ago
C) line III
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Paris
9 months ago
I agree, a list is not efficient for a priority queue.
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Irma
10 months ago
Definitely! A priority queue should be implemented with a deque or a vector.
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Buck
10 months ago
Haha, I know right! Using a list for a priority queue is a bad idea.
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Pamela
10 months ago
B) line II
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Lyda
10 months ago
A) line I
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Carissa
11 months ago
I believe line V is also not valid because it is trying to initialize a priority_queue with iterators from a vector.
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Lauran
11 months ago
I agree with Van, line I is incorrect because it is missing the container type.
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Van
11 months ago
I think line I is not a valid instantiation.
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Maynard
11 months ago
I agree with Mabel. The list is not a valid container for a priority_queue, so line IV is not a valid instantiation.
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Cecily
9 months ago
That makes sense. Thanks for clarifying!
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Sherrell
10 months ago
So, the correct answer would be D) line IV.
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Beckie
10 months ago
Yes, I agree. The correct containers for priority_queue are deque and vector.
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Marget
10 months ago
I think line IV is not valid because list is not a valid container for priority_queue.
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Carmela
11 months ago
I believe line V is also not valid because it is trying to initialize a priority_queue with iterators from a vector.
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Darrin
11 months ago
I agree with Willetta, line I is incorrect because it is missing the container type.
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Mabel
11 months ago
The correct answer is line IV. A priority_queue can only be instantiated with a deque or a vector as the underlying container, not a list.
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Willetta
11 months ago
I think line I is not a valid instantiation.
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