Data Structure MCQ - Complexity

This section focuses on the "Complexity" of the Data Structure. These Multiple Choice Questions (mcq) should be practiced to improve the Data Structure skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. Which of the following case does not exist in complexity theory?

A. Best case
B. Worst case
C. Average case
D. Null case

View Answer

2. What is the time, space complexity of following code:

 
int a = 0, b = 0;
  for (i = 0; i < N; i++) 
  {
     a = a + rand();
  }
  for (j = 0; j < M; j++) 
  {
     b = b + rand();
  }

A. O(N * M) time, O(1) space
B. O(N + M) time, O(N + M) space
C. O(N + M) time, O(1) space
D. O(N * M) time, O(N + M) space

View Answer

3. The complexity of linear search algorithm is

A. O(n)
B. O(log n)
C. O(n2)
D. O(n log n)

View Answer

4.What is the time complexity of following code:

 
int a = 0;
for (i = 0; i < N; i++) 
{
     for (j = N; j > i; j--) 
	 {
       a = a + i + j;
     }
}

A. O(N)
B. O(N*log(N))
C. O(N * Sqrt(N))
D. O(N*N)

View Answer

5. The Worst case occur in linear search algorithm when

A. Item is somewhere in the middle of the array
B. Item is not in the array at all
C. Item is the last element in the array
D. Item is the last element in the array or is not there at all

View Answer

6. What is the time complexity of following code:

 
int i, j, k = 0;
  for (i = n / 2; i <= n; i++) 
  {
     for (j = 2; j <= n; j = j * 2) 
	 {
       k = k + n / 2;
     }
  }
  

A. O(n)
B. O(nLogn)
C. O(n^2)
D. O(n^2Logn)

View Answer

7. The worst case occur in quick sort when

A. Pivot is the median of the array
B. Pivot is the smallest element
C. Pivot is the middle element
D. None of the mentioned

View Answer

8. What does it mean when we say that an algorithm X is asymptotically more efficient than Y?

A. X will always be a better choice for small inputs
B. X will always be a better choice for large inputs
C. Y will always be a better choice for small inputs
D. X will always be a better choice for all inputs

View Answer

9. The complexity of Fibonacci series is

A. O(2n)
B. O(log n)
C. O(n2)
D. O(n log n)

View Answer

10. What is the time complexity of following code:

 
int a = 0, i = N;
  while (i > 0) 
  {
     a += i;
     i /= 2;
  }

A. O(N)
B. O(Sqrt(N))
C. O(N / 2)
D. O(log N)

View Answer

---

Also Check :

---

Discussion