In the context of hash tables, what is the primary purpose of double hashing?Group of answer choicesTo provide an alternative hash function in case of collisions.To reduce the load factor of the hash table.To calculate the initial hash value for a key.To determine the size of the hash table.
Question
In the context of hash tables, what is the primary purpose of double hashing?Group of answer choicesTo provide an alternative hash function in case of collisions.To reduce the load factor of the hash table.To calculate the initial hash value for a key.To determine the size of the hash table.
Solution
The primary purpose of double hashing in the context of hash tables is to provide an alternative hash function in case of collisions.
Here's a step-by-step explanation:
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Hash tables work by computing a hash function on a key, which results in an index into an array where the value should be stored.
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Sometimes, two different keys may hash to the same index. This is known as a collision.
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There are several strategies to handle collisions, one of which is double hashing.
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In double hashing, a second hash function is used to calculate a new hash whenever a collision occurs. This second hash function is designed to be different from the first to minimize the chance that the same collision will occur again.
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Therefore, the primary purpose of double hashing is to provide an alternative hash function in case of collisions, helping to maintain the efficiency of the hash table.
Similar Questions
What is double hashing used for in computer science and data structures?a)Resolving collisions in hash tables.b)Generating random numbers.c)Doubling the size of an array.d)Hashing a value twice for added security.
What is the primary purpose of a hash function in data structures?Group of answer choicesTo generate a unique key for a given inputTo reduce the size of dataTo divide data into fixed-size blocksTo sort the data
Double hashing is generally more efficient than linear probing in terms of collision handling.Group of answer choicesTrueFalse
Double hashing is a closed addressing technique. Group of answer choicesTrueFalse
In a hash table, what is the purpose of a load factor?Group of answer choicesTo calculate the index of a new element.To measure how full the hash table is.To prevent collisions entirely.To determine the size of the hash table.
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