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 > Exact Change > Editorial

Exact Change — Solution & Editorial

Back to the Problem

Track your 5s and 10s. For a 20, prefer giving 10+5 over 5+5+5 — 5s are the universal change and must be hoarded.

Complexity: O(N)

Watch out: Breaking a 20 with three 5s while a 10 is available loses on later customers — greed must protect the 5s.