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 > Total Digit Sum in a Range > Editorial

Total Digit Sum in a Range — Solution & Editorial

Back to the Problem

Digit DP returning a PAIR (count, sum-of-digitsums) per state: when placing digit d over c suffixes, it adds sum_suffix + d·c. Combine over both bounds.

Complexity: O(digits · 10)