Hiring process8 levels
  1. 1 IQ Test
  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 > Keys and Doors > Editorial

Keys and Doors — Solution & Editorial

Back to the Problem

BFS over the EXPANDED state (position, key-bitmask) — up to N·M·26 states. Plain positional BFS cannot represent 'may I pass this door'.

Complexity: O(N M 2K)