Foundations of Data Structures and Algorithms MCQs

Topic-wise practice questions for Data Structures & Algorithms. Test your knowledge, check solutions on demand, and pace your preparation.

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Q51easy
In Open Addressing, what is Linear Probing?
Q52easy
What is a Path in a graph?
Q53medium
If a dataset is sorted but the values are [1, 2, 3, 4, 1000000], which algorithm will perform worst compared to its average case?
Q54easy
Why is accessing an element by index in a standard Array an O(1) operation?
Q55medium
A developer notices that a HashMap search is becoming very slow (O(N)). What is the most likely cause?
Q56medium
You implemented Quick Sort, and it works, but it takes a long time for large, already-sorted arrays. How can you fix this?
Q57hard
In a 64-bit system, a Singly Linked List node stores an int (4 bytes) and a next pointer (8 bytes). What is the total memory used by 100 nodes?
Q58easy
What is the "In-degree" of a vertex in a Directed Graph?
Q59medium
Which of the following O(N \log N) algorithms is **not in-place** (requires O(N) extra space)?
Q60medium
Which search algorithm is specifically optimized for Uniformly Distributed sorted data, such as a numerical sequence or a phone book?