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 > K Generations Up > Editorial

K Generations Up — Solution & Editorial

Back to the Problem

Binary lifting: up[j][v] = 2j-th ancestor, filled by up[j][v] = up[j−1][up[j−1][v]]; decompose K into bits. Naive walking is O(NQ).

Complexity: O((N + Q) log N)