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 > Inside, Outside, or On the Fence > Editorial

Inside, Outside, or On the Fence — Solution & Editorial

Back to the Problem

Ray casting: count edge crossings of a horizontal ray; odd = inside. First test boundary membership exactly (collinear + within the edge's bounding box) using integer cross products.

Complexity: O(NQ)

Watch out: The border must be detected BEFORE the parity test, or on-edge points flip unpredictably.