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 > The N-th Ugly Number > Editorial

The N-th Ugly Number — Solution & Editorial

Back to the Problem

Three-pointer DP: the next ugly number is the min of 2·u[i2], 3·u[i3], 5·u[i5]; advance every pointer that produced the min (handles duplicates like 6).

Complexity: O(N)

Watch out: Advance ALL pointers matching the minimum, or 6 = 2·3 appears twice.