Insertion and deletion operations in Data Structures Theory - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe insertion in an array: "To insert an element at a specific position, we first shift elements to the {{BLANK_1}}."

Data Structures Theory

To insert an element at a specific position, we first shift elements to the [1].

Drag options to blanks, or click blank then click option'

Aleft

Bright

Ctop

Dbottom

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking elements shift left instead of right.

Confusing insertion with deletion.

When inserting into an array, elements from the insertion point onward are shifted to the right to make space.

2fill in blank

medium

Complete the sentence to describe deletion in a linked list: "To delete a node, we change the {{BLANK_1}} of the previous node to skip the deleted node."

Data Structures Theory

To delete a node, we change the [1] of the previous node to skip the deleted node.

Drag options to blanks, or click blank then click option'

Apointer

Bvalue

Cdata

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to change the node's value instead of its pointer.

Confusing index with pointer.

In a linked list, deletion involves changing the pointer of the previous node to point to the node after the deleted one.

3fill in blank

hard

Fix the error in the statement about insertion in a queue: "Insertion in a queue happens at the {{BLANK_1}}."

Data Structures Theory

Insertion in a queue happens at the [1].

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Afront

Bany position

Cmiddle

Drear

Attempts:

3 left

💡 Hint

Common Mistakes

Assuming insertion happens at the front.

Thinking insertion can happen anywhere.

In a queue, insertion (enqueue) happens at the rear end.

4fill in blank

hard

Fill both blanks to describe deletion in a stack: "Deletion happens at the {{BLANK_1}} of the stack, called the {{BLANK_2}}."

Data Structures Theory

Deletion happens at the [1] of the stack, called the [2].

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Atop

Bbottom

Cbase

Dmiddle

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking deletion happens at the bottom or base.

Confusing stack with queue behavior.

Stacks follow LIFO. Deletion (pop) happens at the top of the stack.

5fill in blank

hard

Fill all three blanks to complete the dictionary comprehension that filters and transforms data: "result = {{{{BLANK_1}}}: {{BLANK_2}} for {{BLANK_3}}, v in data.items() if v > 10}"

Data Structures Theory

result = [1]: [2] for [3], v in data.items() if v > 10}

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Ak.upper()

Bv

Ck

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'value' instead of 'v' for values.

Not transforming the key correctly.

Confusing key and value variables.

This comprehension creates a new dictionary with keys uppercased and values unchanged, including only items where value > 10.