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Hashing Questions

Home > Technical Aptitude > Data Structures > Hashing > General Questions
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Choose the correct option.

What is the advantage of using linked list over the doubly linked list for chaining?


Ait takes less memory

Bit causes more collisions

Cit causes less collisions

Dit makes the process of insertion and deletion faster

Answer: Option A

Explanation:

Singly linked list takes lesser space as compared to doubly linked list. But the time complexity of the singly linked list is more than a doubly linked list.

Workspace

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By implementing separate chaining using list head we can reduce the number of collisions drastically.


ATRUE

BFALSE

Answer: Option B

Explanation:

Collision is caused when a hash function returns repeated values. So collisions can be reduced by developing a better hash function. Whereas separate chaining using list head is a collision handling technique so it has no relation with a number of collisions taking place.

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Which of the following is an advantage of open addressing over separate chaining?


Ait is simpler to implement

Btable never gets full

Cit has better cache performance

Dit is less sensitive to hash function

Answer: Option A

Explanation:

Open addressing is the technique which is used for handling collisions in a hash table. It has a better cache performance as everything is stored in the same table.

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86
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Which of the following problems occur due to linear probing?


APrimary collision

BSecondary collision

CExtendible hashing

DSeparate chaining

Answer: Option A

Explanation:

Primary collision occurs due to linear probing technique. It is overcome using a quadratic probing technique.

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Which of the following technique stores data in a separate entity in case of a collision?


AOpen addressing

BChaining using doubly linked list

CDouble hashing

DLinear probing

Answer: Option B

Explanation:

Chaining using doubly linked list is used to store data in a separate entity (doubly linked list in this case) in case of a collision. Whereas open addressing stores it in the table itself.

Workspace

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112
Solv. Corr.
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Collision is caused due to the presence of two keys having the same value.


ATRUE

BFALSE

Answer: Option A

Explanation:

A collision is caused due to the presence of two keys having the same value. It is handled by using any one of the two methods namely:- Chaining and Open addressing.

Workspace

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Which of the following variant of a hash table has the best cache performance?


Ahash table using a linked list for separate chaining

Bhash table using binary search tree for separate chaining

Chash table using a doubly linked list for separate chaining

Dhash table using open addressing

Answer: Option D

Explanation:

Implementation of the hash table using open addressing has a better cache performance as compared to separate chaining. It is because open addressing stores data in the same table without using any extra space.

Workspace

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What is the advantage of hashing with chaining?


Acache performance is good

Buses less space

Chas a time complexity of O(n) in the worst case

Dless sensitive to hash function

Answer: Option D

Explanation:

Hashing with separate chaining has an advantage that it is less sensitive to a hash function. It is also easy to implement.

Workspace

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59
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Solv. In. Corr.
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What is the disadvantage of hashing with chaining?


Anot easy to implement

Btakes more space

Ctable gets filled up easily

Dquite sensitive to hash function

Answer: Option B

Explanation:

Hashing with separate chaining has a disadvantage that it takes more space. This space is used for storing elements in case of a collision.

Workspace

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32
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92
Solv. In. Corr.
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Which scheme uses a randomization approach?


Ahashing by division

Bhashing by multiplication

Copen addressing

Duniversal hashing

Answer: Option D

Explanation:

Universal hashing scheme uses a randomization approach whereas hashing by division and hashing by multiplication are heuristic in nature.

Workspace

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