Data Structures & Algorithms

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Q. What is a potential issue with using a poor hash function?
  • A. Increased memory usage
  • B. Faster access times
  • C. Higher collision rates
  • D. Easier debugging
Q. What is the 'union by rank' optimization in Disjoint Set Union?
  • A. Always attaching the smaller tree under the larger tree
  • B. Always attaching the larger tree under the smaller tree
  • C. Randomly attaching trees
  • D. Merging trees based on their height
Q. What is the average time complexity for searching an element in a hash table?
  • A. O(n)
  • B. O(log n)
  • C. O(1)
  • D. O(n^2)
Q. What is the effect of a poor hash function on a hash table?
  • A. Increased speed of operations
  • B. More collisions and decreased performance
  • C. Better memory utilization
  • D. No effect on performance
Q. What is the ideal load factor for a hash table to maintain efficient performance?
  • A. 0.1
  • B. 0.5
  • C. 1.0
  • D. 2.0
Q. What is the initial state of a Disjoint Set Union when n elements are added?
  • A. All elements are in a single set
  • B. All elements are in separate sets
  • C. All elements are sorted
  • D. All elements are merged
Q. What is the initial state of each element in a Disjoint Set Union when it is first created?
  • A. Each element is its own set
  • B. All elements are in a single set
  • C. Elements are sorted
  • D. Elements are in random sets
Q. What is the main advantage of using path compression in Disjoint Set Union?
  • A. It reduces the number of elements in a set
  • B. It speeds up the union operation
  • C. It flattens the structure of the tree for faster future queries
  • D. It allows for duplicate elements
Q. What is the main advantage of using path compression in the 'Find' operation?
  • A. It increases the size of the data structure
  • B. It reduces the time complexity of future operations
  • C. It makes the data structure more complex
  • D. It allows for multiple unions at once
Q. What is the main advantage of using union by rank in Disjoint Set Union?
  • A. It increases the size of the sets
  • B. It minimizes the height of the trees
  • C. It allows for faster sorting
  • D. It simplifies the code
Q. What is the main disadvantage of using open addressing for collision resolution?
  • A. It requires more memory
  • B. It can lead to clustering
  • C. It is slower than chaining
  • D. It cannot handle deletions
Q. What is the maximum height of a binary heap with n elements?
  • A. n
  • B. log n
  • C. n log n
  • D. 2n
Q. What is the maximum number of elements in a binary heap of height h?
  • A. 2^h
  • B. 2^(h+1) - 1
  • C. h + 1
  • D. h^2
Q. What is the primary advantage of using a binary heap over an unsorted array for implementing a priority queue?
  • A. Faster insertion
  • B. Faster deletion
  • C. Better memory usage
  • D. Easier implementation
Q. What is the primary advantage of using a Fibonacci heap over a binary heap?
  • A. Faster insertion time
  • B. Lower memory usage
  • C. Faster decrease-key operation
  • D. Easier implementation
Q. What is the primary advantage of using a priority queue over a regular queue?
  • A. Faster access to elements
  • B. Elements are processed in the order of their priority
  • C. Lower memory usage
  • D. Easier implementation
Q. What is the primary difference between a binary heap and a binary search tree?
  • A. Binary heaps are complete binary trees, while binary search trees are not
  • B. Binary heaps allow duplicate elements, while binary search trees do not
  • C. Binary heaps are used for priority queues, while binary search trees are used for searching
  • D. All of the above
Q. What is the primary purpose of a hash function in a hash table?
  • A. To sort the data
  • B. To generate unique keys
  • C. To map data to a fixed size
  • D. To encrypt the data
Q. What is the primary purpose of the Disjoint Set Union (Union Find) data structure?
  • A. To sort elements efficiently
  • B. To find the shortest path in a graph
  • C. To manage a collection of disjoint sets
  • D. To implement a stack
Q. What is the primary use of a priority queue?
  • A. Sorting elements
  • B. Finding the shortest path
  • C. Managing tasks based on priority
  • D. Storing elements in a specific order
Q. What is the purpose of a hash function in a hash table?
  • A. To sort the data
  • B. To encrypt the data
  • C. To map keys to indices
  • D. To store data in a binary tree
Q. What is the result of a poor hash function?
  • A. Increased memory usage
  • B. Faster access times
  • C. More collisions
  • D. Better data organization
Q. What is the result of performing a 'decrease key' operation in a min-heap?
  • A. The key is increased
  • B. The key is decreased and the heap property is maintained
  • C. The key is removed
  • D. The heap is destroyed
Q. What is the result of performing a 'Union' operation on two sets A and B in Disjoint Set Union?
  • A. A and B remain separate
  • B. A and B are merged into one set
  • C. A is deleted
  • D. B is deleted
Q. What is the result of performing a 'Union' operation on two sets in Disjoint Set Union?
  • A. It creates a new set containing elements from both sets
  • B. It removes one of the sets
  • C. It finds the common elements between the two sets
  • D. It does nothing if the sets are already connected
Q. What is the result of performing a 'Union' operation on two sets that are already connected in Disjoint Set Union?
  • A. The sets remain unchanged
  • B. A new set is created
  • C. An error occurs
  • D. The operation fails
Q. What is the result of performing a 'Union' operation on two sets that are already connected?
  • A. The sets remain unchanged
  • B. A new set is created
  • C. An error occurs
  • D. The sets are split
Q. What is the result of performing a heap sort on an array?
  • A. An unsorted array
  • B. A partially sorted array
  • C. A sorted array
  • D. A reverse sorted array
Q. What is the result of performing a union operation on two sets A and B in a Disjoint Set Union?
  • A. A and B remain separate
  • B. A and B are merged into one set
  • C. A is deleted
  • D. B is deleted
Q. What is the space complexity of a binary heap storing n elements?
  • A. O(1)
  • B. O(n)
  • C. O(log n)
  • D. O(n log n)
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