Practice Checking Free Square (32.3.3) - Backtracking, N queens - Part B
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Checking Free Square

Practice - Checking Free Square

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Practice Questions

Test your understanding with targeted questions

Question 1 Easy

What does it mean for a square on the board to be 'under attack'?

💡 Hint: Consider the positions from where the queen could attack.

Question 2 Easy

How can we represent whether a specific row is under attack?

💡 Hint: Think of a binary value: 0 or 1.

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

What is the main purpose of the attack array in the N-Queens problem?

To track points where queens can be placed
To identify which squares are under attack
To list all possible queen configurations

💡 Hint: Think about the safety of each square regarding queen placements.

Question 2

True or False: A square is free if its row, column, and both diagonals are all set to 1.

True
False

💡 Hint: Refresh your understanding of attack markers.

1 more question available

Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

Consider a 5x5 board. Outline a method to check placements of multiple queens and identify the recursion needed to ensure no queens can attack each other.

💡 Hint: Remember how to reset the markers when backtracking.

Challenge 2 Hard

Implement a Python function that takes an N value and returns all valid queen placements on an N x N board using the discussed strategies.

💡 Hint: Your function should be efficient; ensure you're using the right conditions to add or remove queens.

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Reference links

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