HTables_3
Double hashing is a form of open addressing.

Question

BlackTom AI · Accepted Answer

The question asks whether double hashing is a form of open addressing, so we should evaluate the claim against how double hashing works.
Option 1: True. Double hashing is indeed a collision resolution scheme used in open addressing. When a bucket is occupied, a second hash function is used to compute a step size for probing, which helps determine the next slot to try. Since all probes come from within the hash table and no links to other structures are used, it fits the definition of open addressing.
Option 2: False. If one argued that double hashing is not open addressing, the mistake would be to confuse it with separate chaining, where collisions are resolved by maintaining a linked list at each bucket. However, double hashing does not use external chains; it resolves collisions by stepping through slots within the table itself according to a second hash, which is the hallmark of open addressing. 
Extra nuance: compared to other probing strategies like linear or quadratic probing, double hashing tends to reduce clustering because the probe sequence is more random and depends on the key via two hash functions. This reinforces its placement under open addressing rather than any form of chaining or non-probing collision handling.
In summary, the proposed statement correctly identifies double hashing as an open addressing technique, since all collision resolution occurs within the hash table using a second hash to determine probe steps.

HTables_3 Double hashing is a form of open addressing.

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