Spiral Matrix Traversal in DSA Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the starting row index for spiral traversal.

DSA Python

top = [1]

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A0

B-1

C1

Dlen(matrix)

Attempts:

3 left

💡 Hint

Common Mistakes

Starting top at 1 instead of 0 causes skipping the first row.

Using negative indices here confuses the traversal.

The top row index starts at 0 because matrix indexing begins from 0.

2fill in blank

medium

Complete the code to move the left boundary right after traversing the left column.

DSA Python

left [1]= 1

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A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Decreasing left boundary instead of increasing it.

Using multiplication or division operators here.

After traversing the left column, we move the left boundary right by increasing it by 1.

3fill in blank

hard

Fix the error in the loop condition to continue spiral traversal while boundaries are valid.

DSA Python

while top [1] bottom and left <= right:

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A>

B<=

C<

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < causes missing the last row.

Using > or >= reverses the logic and breaks the loop.

The loop should continue while the top boundary is less than or equal to the bottom boundary to cover all rows.

4fill in blank

hard

Fill both blanks to correctly traverse the top row from left to right.

DSA Python

for i in range([1], [2] + 1):
    result.append(matrix[top][i])

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Aleft

Bright

Ctop

Dbottom

Attempts:

3 left

💡 Hint

Common Mistakes

Using top or bottom as loop range indices instead of left and right.

Not adding +1 to include the right boundary.

We traverse the top row from the left boundary to the right boundary inclusive.

5fill in blank

hard

Fill all three blanks to traverse the right column from top+1 to bottom and then update the right boundary.

DSA Python

for i in range([1] + 1, [2] + 1):
    result.append(matrix[i][[3]])
right -= 1

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

Atop

Bbottom

Cright

Dleft

Attempts:

3 left

💡 Hint

Common Mistakes

Starting from top instead of top + 1 causes duplicate elements.

Using left instead of right for the column index.

Not updating the right boundary after traversal.

Traverse from the row below top to bottom along the right column, then move the right boundary left.