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 > Reverse a Number > Editorial

Reverse a Number — Solution & Editorial

Back to the Problem

Reverse the string and strip leading zeros, or rebuild the number arithmetically digit by digit.

Complexity: O(number of digits)

Watch out: The reverse of a valid 64-bit number still fits in 64 bits here, but leading zeros must not be printed.