DSA Studio

Backtracking Checkpoint

Work fresh traces, diagnose invalid implementations, and identify model boundaries.

Get every question correct to pass this checkpoint. You can review feedback, revise your answers, and submit again.

1. How many subsets does a set of four distinct elements have?
2. A permutation builder appends its current mutable path directly to results. Why can earlier answers later change?

Select one answer.

3. For N-Queens, queens at (0,1) and (2,3) attack each other for what reason?

Select one answer.

4. How many permutations are there of three distinct elements?
5. After exploring a choice, a used-element flag remains set. What is the consequence?

Select one answer.

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