Hash function concept in Data Structures Theory - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to show what a hash function does to a key.

Data Structures Theory

hashed_value = hash([1])

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Alist

Bvalue

Cindex

Dkey

Attempts:

3 left

💡 Hint

Common Mistakes

Using the value instead of the key as input to the hash function.

A hash function takes a key as input and returns a hashed value. This hashed value is used to find the data quickly.

2fill in blank

medium

Complete the code to create a hash table entry using a hash function.

Data Structures Theory

index = hash(key) [1] table_size

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A+

B/

C%

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using division (/) instead of modulo (%) causes wrong index calculation.

The modulo operator % is used to keep the hash value within the table size, so the index fits in the table.

3fill in blank

hard

Fix the error in the hash function usage to get a valid index.

Data Structures Theory

index = hash([1]) % table_size

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Aindex

Bkey

Ctable_size

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Applying hash to the value or index instead of the key.

The hash function must be applied to the key, not the value or other variables, to get a correct index.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps keys to their hash indexes.

Data Structures Theory

{key: hash(key) [1] table_size for key [2] keys}

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A%

Bin

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' instead of '%' or wrong loop keyword.

The modulo operator % keeps the hash within table size. The keyword in is used to loop over keys.

5fill in blank

hard

Fill all three blanks to create a hash table lookup that checks if a key's hash index matches a stored index.

Data Structures Theory

if hash([1]) [2] table_size == [3]:

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Akey

B%

Cstored_index

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using value instead of key or wrong operator instead of modulo.

The key is hashed and modulo applied to get the index. This index is compared to the stored index to find the correct slot.