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 > Kaprekar's Routine > Editorial

Kaprekar's Routine — Solution & Editorial

Back to the Problem

Direct simulation; the routine converges within 7 steps for every valid input.

Complexity: O(1)

Watch out: Keep the 4-digit zero padding during every step — 999 becomes 0999, not 999.