Which of the following is true about hash tables?Group of answer choicesThey are not suitable for implementing dictionaries or associative arrays.They are efficient for searching, insertion, and deletion.They are sorted data structures.They guarantee constant time operations for all operations.
Question
Which of the following is true about hash tables?Group of answer choicesThey are not suitable for implementing dictionaries or associative arrays.They are efficient for searching, insertion, and deletion.They are sorted data structures.They guarantee constant time operations for all operations.
Solution
The correct statement about hash tables is: "They are efficient for searching, insertion, and deletion."
Here's why:
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Hash tables are indeed suitable for implementing dictionaries or associative arrays. They map keys to values, making them ideal for these purposes. So, the first statement is false.
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Hash tables are efficient for searching, insertion, and deletion. These operations can often be done in constant time, assuming a good hash function and load factor. So, the second statement is true.
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Hash tables are not sorted data structures. The order of elements in a hash table depends on the hash function, not on any sort of inherent ordering of the elements themselves. So, the third statement is false.
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While hash tables can often perform operations in constant time, this is not a guarantee. The time complexity can degrade to linear time in the worst case, such as when all keys hash to the same index. So, the fourth statement is false.
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You are designing a spell-checking system for a word processing application. You need to efficiently store and retrieve a large dictionary of words with their associated data. Which data structure would you choose, and why?a)A symbol table implemented as a hash table, because it provides fast lookups for a large dataset.b)An array, because it allows for constant-time lookups.c)A linked list, because it can efficiently manage collisions.d)A binary search tree, because it ensures data is sorted alphabetically
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