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 > Valid IPv4 Address > Editorial

Valid IPv4 Address — Solution & Editorial

Back to the Problem

Split on dots: exactly four all-digit parts, each ≤ 255, no leading zero unless the part is exactly 0.

Complexity: O(|S|)