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  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 > Domino Tilings of 2xN > Editorial

Domino Tilings of 2xN — Solution & Editorial

Back to the Problem

Tilings satisfy f(n)=f(n−1)+f(n−2) with f(1)=1, f(2)=2 — a Fibonacci shift solved by matrix power.

Complexity: O(log N)