FAQs

Yes, you may re-submit problem sets that you completed in 2013, 2014, or 2015 for credit in 2016. To re-submit, simply follow the instructions under How to Submit in the specifications for each of CS50x 2016’s problem sets. However, know that some of 2016’s problem sets are different from past years'. Here’s what’s new in 2016.

CS50x 2016 uses the same gradebook as CS50x 2015. If you submitted some problem set in 2015 and received a score >= 0.6, you do not need to re-submit it in 2016, even if that problem set has changed. If you do re-submit in 2016 some problem set that you also submitted in 2015, your new submission must meet 2016’s expectations, per the problem set’s spec.

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!

As of 2016, the CS50 Appliance has been replaced with CS50 IDE, a web-based integrated development environment. While using the CS50 Appliance is still possible (with some effort), best to use CS50 IDE now for Problem Sets 1 through 8, per their specs.

Only one, when the course itself ends! You are welcome to take CS50x at your own pace, so long as you submit nine problem sets and submit a final project no later than 31 December 2016, per the schedule.

No, afraid CS50x is too large! However, office hours are available to students taking CS50 through Harvard College or Harvard Extension School. See cdn.cs50.net/2016/x/references/compare/compare.html.

No, only students taking CS50 at Harvard University and Yale University have quizzes!

To be answered in a few days!

To be answered in a few days!

Yes. CS50x offers Verified Certificates of Achievement through edX (as well as course credit from Harvard Extension School).

See cdn.cs50.net/2015/x/references/compare/compare.html to compare options.

If you paid for a Verified Certificate in 2015 (or 2016), you have until 31 December 2016 to complete CS50x. Email help@edx.org if your dashboard indicates that your verification has expired.

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.

Yes, just realize that some of 2016’s problem sets are new, and some are a bit different. See cdn.cs50.net/2016/x/references/new/new.html for an overview of what’s new. But also be sure to read each problem set’s spec to be sure your code is consistent with 2016’s expectations. And be sure to (re-)submit each problem set’s form in addition to your code, as per each of 2016’s specs.

Nope, even if this is your first time here, you’re not too late to begin! You are welcome to take CS50x at your own pace, per the schedule, starting whenever you’d like, so long as you finish before 31 December 2016.

Hard to say! Odds are teenagers can do just fine. Younger students might need a hand from a parent, but we have had students as young as 10 years old taking CS50x. And even a bit younger!

Odds are 2016’s will resemble this sample.

Even though edX’s video player relies on YouTube, all of CS50x’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 CS50x’s servers.