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 > Paint and Sum > Editorial

Paint and Sum — Solution & Editorial

Back to the Problem

A segment tree with a lazy 'assign' tag (distinct from lazy add): pushing an assignment overwrites a subtree's sum to v×length. (An interval set / Chtholly tree also works when assignments dominate.)

Complexity: O((N + Q) log N)

Watch out: Assignment lazy tags overwrite (not accumulate) — mixing them with add tags requires careful ordering.