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 > Partitions into K Groups > Editorial

Partitions into K Groups — Solution & Editorial

Back to the Problem

The explicit formula S(N, K) = (1/K!) ∑j=0..K (−1)j C(K, j) (K−j)N is O(K log N) with modular factorials.

Complexity: O(K log N)