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 > Sum of Digits > Editorial

Sum of Digits — Solution & Editorial

Back to the Problem

Repeatedly take N mod 10 and divide by 10, or process the number as a string.

Complexity: O(number of digits)

Watch out: N does not fit in 32 bits — read it as a 64-bit integer or a string.