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The concatenation of two lists is to be performed in O(1) time. Which of the following implementations of a list should be used?
  • a)
    singly linked list
  • b)
    doubly linked list
  • c)
    circular doubly linked list
  • d)
    array implementation of lists
Correct answer is option 'C'. Can you explain this answer?
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The concatenation of two lists is to be performed in O(1) time. Which ...
Singly linked list cannot be answer because we cannot find last element of a singly linked list in O(1) time.
Doubly linked list cannot also not be answer because of the same reason as singly linked list.
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Barrier is a synchronization construct where a set of processes synchronizes globally i.e. each process in the set arrives at the barrier and waits for all others to arrive and then all processes leave the barrier. Let the number of processes in the set be three and S be a binary semaphore with the usual P and V functions. Consider the following C implementation of a barrier with line numbers shown on left.void barrier (voi d) {1: P(S);2: process_arrived++;3. V(S);4: while (process_arrived !=3);5: P(S);6: process_left++;7: if (process_left==3) {8: process_arrived = 0;9: process_left = 0;10: }11: V(S);}The variables process_arrived and process_left are shared among all processes and are initialized to zero. In a concurrent program all the three processes call the barrier function when they need to synchronize globally. The above implementation of barrier is incorrect. Which one of the following is true?

Barrier is a synchronization construct where a set of processes synchronizes globally i.e. each process in the set arrives at the barrier and waits for all others to arrive and then all processes leave the barrier. Let the number of processes in the set be three and S be a binary semaphore with the usual P and V functions. Consider the following C implementation of a barrier with line numbers shown on left.void barrier (voi d) {1: P(S);2: process_arrived++;3. V(S);4: while (process_arrived !=3);5: P(S);6: process_left++;7: if (process_left==3) {8: process_arrived = 0;9: process_left = 0;10: }11: V(S);}Q.The variables process_arrived and process_left are shared among all processes and are initialized to zero. In a concurrent program all the three processes call the barrier function when they need to synchronize globally. The above implementation of barrier is incorrect. Which one of the following is true?

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The concatenation of two lists is to be performed in O(1) time. Which of the following implementations of a list should be used?a)singly linked listb)doubly linked listc)circular doubly linked listd)array implementation of listsCorrect answer is option 'C'. Can you explain this answer?
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