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Data Structures Interview Questions With Answers

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What is a data structure?
A data structure is a way of organizing and storing data in a computer system so that it can be accessed and used efficiently.

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What are the different types of data structures?
The different types of data structures include arrays, linked lists, stacks, queues, trees, graphs, and hash tables.

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What is an array?
An array is a collection of elements of the same data type that are stored together in contiguous memory locations.

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What is a linked list?
A linked list is a data structure consisting of a sequence of nodes, where each node contains a data element and a reference (pointer) to the next node in the sequence.

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What is a stack?
A stack is a data structure that allows elements to be inserted and removed in a last-in, first-out (LIFO) order.

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What is a queue?
A queue is a data structure that allows elements to be inserted at the back and removed from the front in a first-in, first-out (FIFO) order.

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What is a tree?
A tree is a data structure consisting of nodes, where each node has a value and references to its child nodes, which are also trees.

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What is a graph?
A graph is a data structure consisting of vertices (nodes) and edges that connect them.

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What is a hash table?
A hash table is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.

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What is a binary search tree?
A binary search tree is a tree data structure where each node has at most two children, and the left child is less than the parent and the right child is greater than the parent.

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What is a priority queue?
A priority queue is a data structure that allows elements to be inserted and removed based on a priority value assigned to each element.

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What is a heap?
A heap is a specialized binary tree data structure that satisfies the heap property, where the parent node is always greater or equal to its children.

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What is a trie?
A trie is a tree-like data structure that stores a set of strings or sequences, where each node represents a common prefix of the strings.

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What is a red-black tree?
A red-black tree is a self-balancing binary search tree where each node is colored either red or black, and certain rules are enforced to maintain balance.

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What is a B-tree?
A B-tree is a self-balancing tree data structure that allows efficient retrieval and insertion of data in external memory.

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What is a AVL tree?
An AVL tree is a self-balancing binary search tree where the heights of the two child subtrees of any node differ by at most one.

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What is a suffix tree?
A suffix tree is a tree-like data structure that stores all the suffixes of a given string, allowing for efficient substring searches.

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What is a skip list?
A skip list is a probabilistic data structure that allows efficient search, insertion, and deletion operations on a linked list.

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What is a bloom filter?
A bloom filter is a probabilistic data structure that allows efficient membership queries for a set of elements, but may have false positives.

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What is a disjoint-set data structure?
A disjoint-set data structure is a data structure that stores a collection of disjoint sets and allows efficient union and find operations to determine if two elements belong to the same set.

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Conclusion

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