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 > Numbers That Contain D > Editorial

Numbers That Contain D — Solution & Editorial

Back to the Problem

Complement counting: numbers with NO digit D are easy to count by a digit walk (each free position has 9 choices); subtract from N.

Complexity: O(log N)