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 > Zero Triplets > Editorial

Zero Triplets — Solution & Editorial

Back to the Problem

Sort and two-pointer per anchor, multiplying duplicate-run lengths when a match is found (the equal-values case collapses to C(k,2)). An O(N²) map approach also fits.

Complexity: O(N2)

Watch out: Counting by index with duplicate values is the hard part — run-length multiply, don't skip.