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Which data structure is used to represent hierarchical relationships like file systems?
A. Tree
B. Array
C. Stack
D. Queue
Answer: Tree
What is the time complexity of the binary search algorithm on a sorted array?
A. O(log n)
B. O(n)
C. O(n log n)
D. O(1)
Answer: O(log n)
Which of the following algorithms is used for finding a minimum spanning tree?
A. Kruskal's Algorithm
B. Dijkstra's Algorithm
C. Bellman-Ford Algorithm
D. Floyd-Warshall Algorithm
Answer: Kruskal's Algorithm
In a doubly linked list, what is the time complexity of accessing the `k`-th element?
A. O(k)
B. O(1)
C. O(log k)
D. O(n)
Answer: O(k)
Which of the following is a characteristic of a min-heap?
A. The parent node is less than or equal to its children
B. The parent node is greater than or equal to its children
C. The tree is always balanced
D. The left subtree is always greater than the right subtree
Answer: The parent node is less than or equal to its children
Which data structure is used to implement a LIFO (Last In First Out) order?
A. Stack
B. Queue
C. Linked List
D. Array
Answer: Stack
What is the time complexity of accessing an element in a hash table?
A. O(1)
B. O(n)
C. O(log n)
D. O(n log n)
Answer: O(1)
Which technique is used to solve problems that can be broken down into smaller subproblems that are solved independently?
A. Divide and Conquer
B. Greedy Algorithm
C. Dynamic Programming
D. Backtracking
Answer: Divide and Conquer
Which problem-solving technique uses the principle of ‘optimal substructure’?
A. Dynamic Programming
B. Greedy Algorithm
C. Backtracking
D. Divide and Conquer
Answer: Dynamic Programming