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  2. 2 Additional Online Test (If Required)
  3. 3 Office Interview with Hiring Manager
  4. 4 Unpaid Test Task (Motivation Check)
  5. 5 Paid Test Task and Follow-Up Interview
  6. 6 Iterative Paid Test Tasks
  7. 7 Office Verification
  8. 8 Final Interview with the Founder

Problems > Broken Calculator > Editorial

Broken Calculator — Solution & Editorial

Back to the Problem

Reason backwards from B: halve when even, increment when odd; once B ≤ A the rest are decrements (forwards). Forward greedy over-doubles.

Complexity: O(log B)

Watch out: Forward reasoning fails (when to stop doubling?) — the backwards moves are forced.