Hash map vs hash set in Data Structures Theory - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe a hash map.

Data Structures Theory

A hash map stores data as key[1]value pairs.

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Ato

Band

C:

Dwith

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'and' or 'to' which do not represent the key-value relationship.

Confusing the connection symbol between key and value.

A hash map stores data as key:value pairs, where each key maps to a value.

2fill in blank

medium

Complete the sentence to describe a hash set.

Data Structures Theory

A hash set stores only unique [1] without any associated values.

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Aindexes

Bvalues

Cpairs

Dkeys

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'values' which implies associated data, not correct for sets.

Choosing 'pairs' which applies to maps, not sets.

A hash set stores only unique keys (or elements) without associated values.

3fill in blank

hard

Fix the error in the statement about hash maps.

Data Structures Theory

In a hash map, each [1] must be unique, but values can repeat.

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Avalue

Bkey

Cpair

Delement

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing keys and values uniqueness.

Thinking values must be unique in a hash map.

In a hash map, keys must be unique to identify values, but values can be duplicated.

4fill in blank

hard

Fill both blanks to compare hash map and hash set.

Data Structures Theory

A hash map stores [1] pairs, while a hash set stores only [2].

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Akey-value

Bunique values

Cunique keys

Dindex-value

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up keys and values for sets.

Using 'index-value' which is not related to hash sets or maps.

A hash map stores key-value pairs, while a hash set stores only unique keys (elements).

5fill in blank

hard

Fill all three blanks to complete the differences between hash map and hash set.

Data Structures Theory

In a hash map, [1] are unique and map to [2], but in a hash set, only [3] are stored.

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Akeys

Bvalues

Cunique elements

Dindexes

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing values with keys in sets.

Thinking sets store indexes.

In a hash map, keys are unique and map to values, but in a hash set, only unique elements (keys) are stored without values.