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 > Working Together > Editorial

Working Together — Solution & Editorial

Back to the Problem

Combined rate is 1/A + 1/B = (A+B)/(AB); the time is the reciprocal. Reduce by the gcd.

Complexity: O(1) or O(log)

Watch out: AB overflows 64 bits at 109 each in C++ — reduce by gcd before multiplying (or use 128-bit).