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 > All the Rectangles > Editorial

All the Rectangles — Solution & Editorial

Back to the Problem

A rectangle is a choice of two distinct horizontal lines (N+1 available) and two vertical lines: C(N+1,2)·C(M+1,2).

Complexity: O(1)

Watch out: ~2.5×1019 at the limit — 128-bit or big integers (Python is safe).