Problem Set 3

Collaboration on problem sets is not permitted except to the extent that you may ask classmates and others for help so long as that help does not reduce to another doing your work for you, per the course’s policy on academic honesty.

The staff conducts random audits of submissions to CS50x. Students found to be in violation of this policy will be removed from the course. Students who have already completed CS50x, if found to be in violation, will have their CS50 Certificate permanently revoked.

What to Do

Submit Sort
Submit Plurality
Submit one of:
- Runoff, if feeling more or less comfortable
- Tideman, if feeling very, very, very comfortable

If you submit both Runoff and Tideman, we’ll record the higher of your two scores. Note that Tideman is optional but challenging!

When to Do It

The below deadline is the deadline to submit this version of this problem set, but the course’s overall deadline has already been extended to 30 June 2026.

Starting on 1 January 2026, you will have to use the 2026 version of this problem set, and won’t be able to submit this version any longer, which is why the deadline appears below as it does. But the course continues into 2026!

By 2025-12-31T23:59:00+00:00.

Advice

Try out any of David’s programs from class via Week 3’s source code.
If you see any errors when compiling your code with make, focus first on fixing the very first error you see, scrolling up as needed. If unsure what it means, try asking help50 for help. For instance, if trying to compile plurality, and
```
make plurality
```
is yielding errors, try running
```
help50 make plurality
```
instead!