Problem Set 1

What to Do

1. Log into submit.cs50.io using your GitHub account and click Authorize cs50, then close the tab.
2. Log into cs50.dev using your GitHub account to access your very own “codespace.”
3. Once your codespace has loaded, close any Welcome tabs that might have opened by default.
4. Run update50 in your codespace’s terminal window to ensure that your codespace is up-to-date and, if prompted, click Rebuild now.
5. Complete Hello, World.
6. Submit Hello, It’s Me.
7. Submit one of:
   • this version of Seats, if feeling less comfortable
   • this version of Seats, if feeling more comfortable
8. Submit one of:
   • Cash, if feeling less comfortable
   • Credit, if feeling more comfortable

If you submit both versions of Seats, we’ll record the higher of your two scores. If you submit both Cash and Credit, we’ll record the higher of your two scores.

When to Do It

By 2026-09-13T23:59:00-04:00.

How to Get Help

• Post a question (and search for past answers) on Ed Discussion!
• Attend office hours!
• Email heads@cs50.harvard.edu!

Advice

• See CS50’s style guide for C for tips on how to improve your code’s style.
• If you see an error message that you don’t understand, look just below it: help50 will offer a hint in yellow if it recognizes the error, or a help50 button atop your terminal window that you can click to ask the duck about it.