FAQs

Yes, you may re-submit problem sets and your most recent submission is what will be graded.

Yes, if you have particularly slow, expensive, or infrequent Internet access, see https://cs50.readme.io/v2015/docs/offline for details on how you can run your own copy of CS50 IDE locally on your own computer! Stay tuned for even more detailed instructions!

Only one, when the course itself ends! You are welcome to take CS50 AP at your own pace, so long as you submit all problems no later than 30 April 2018.

No, afraid CS50 AP is too large! However, office hours are available to students taking CS50 through Harvard College or Harvard Extension School.

No, only students taking CS50 AP through their own high school would have quizzes depending on their particular teacher.

Yes; students who complete all the problems with a 60% or higher are eligible for a certificate.

If you joined CS50’s Facebook Group but don’t want to see new posts in your newsfeed, hover over in the top-right corner of any of the group’s posts in your newsfeed, then select Unfollow CS50 from that menu, per the below. You’ll still be in the group, so you can still visit it at https://www.facebook.com/groups/cs50 anytime you’d like. Note that old posts won’t disappear from your newsfeed (unless you select *I don’t want to see this for each of them), but new posts will no longer appear. CS50 will thus gradually disappear from your newsfeed as other posts appear.*

If using Chrome, Firefox, or Safari (i.e., a browser that supports HTML5 and MP4), you should see a SPEED control below each video, per the below. If not, your browser might not support different speeds, in which case you can download the video (as via the blue links beneath it) and use a client-side player like VLC, whose Playback menu should allow you to alter playback speed. Beware, though, David talks fast at 1x, let alone 2x!

If you joined CS50’s Facebook Group but don’t want to receive notifications about it, simply visit https://www.facebook.com/groups/cs50/, click Notifications at top-right, and then select Off, per the below. You’ll still be in the group, so you can still visit it at https://www.facebook.com/groups/cs50 anytime you’d like.

Nope, even if this is your first time here, you’re not too late to begin! You are welcome to take CS50 AP at your own pace, starting whenever you’d like, so long as you finish before 30 April 2018.

Odds are 2017’s will resemble this sample.

Even though edX’s video player relies on YouTube, all of CS50 AP’s videos are downloadable multiple resolutions (240p, 360p, 720p, 1080p, and sometimes 4K). Under any (blocked) video, look for blue links like the below, which will allow you to download videos from CS50 AP’s servers.