Which of the following is true about hash tables?Group of answer choicesThey are not suitable for implementing dictionaries or associative arrays.They are sorted data structures.They are efficient for searching, insertion, and deletion.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 sorted data structures.They are efficient for searching, insertion, and deletion.They guarantee constant time operations for all operations.
Solution
The correct answer 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 allow you to store and retrieve values using a key, which is exactly what you need for a dictionary or associative array.
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Hash tables are not sorted data structures. The order of elements in a hash table depends on the hash function and not on some sort of sortable value.
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Hash tables are efficient for searching, insertion, and deletion. If the hash function is good and the table is not too full, these operations can often be done in constant time.
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Hash tables do not guarantee constant time operations for all operations. The time complexity can degrade to linear time in the worst case scenario, such as when all keys hash to the same index, causing a lot of collisions.
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