S&P Global Software Developer interview questions

On-Campus: Written test followed by a follow-up in person interview. On-site: 3 back to back technical interviews, 40-45 minutes each. Questions: 1. Design "Undo" and "Redo" feature for a text editor. 2. Given an integer array, return "1" if sum of any two numbers is zero. 3. Use two dice to create a random number generator (0-15). 4. What is a Race Condition? 5. Given a continuous stream of characters, find the first non-repeating character.