I've been working on adding a bunch of new exercises to the Rust track in http://exercism.io. So if you have experimented with Exercism, or are just looking for new ways to practice your Rust skills, you now have some new problems to work on:
We're also interested in getting more opinions on aspects of the Rust track in Exercism. Most importantly, we want to review the default order of our problems. Our goal here is to make sure the problems introduce Rust in an order that is easy for newcomers to the language.
And if there are other coding exercises that you think would be good to have in the Rust track, let us know!
I love exercism. The new version, however, requires that solutions be "mentored" before moving on. I'd like this thread to serve as a call for experienced devs to consider being mentors on exercism for the rust track as there is currently a backlog, taking several days to get a solution approved. Perhaps @IanWhitney can tell us how one becomes a mentor at exercism.
This is true, but going that route means mentors will not be notified to glance at your code. You also will not get "credit" for finishing the track, if that matters to you. I have found that submitting an exercise unlocks ancillary exercises (i.e., those not in the main track), which can be worked on and submitted while awaiting mentor acceptance of the main track solution.
Actually, usize cannot ever be < 0. You will need to use a signed integer for the field type if you need values that can be < 0.
You should use the term permutations instead of combinations. In permutations the order of elements matters, in combinations it does not.
For proposing new problems in a language track you should probably make a pull request on the github repo for that track, though I think the recent relaunch of exercism uses a central repository of problems, so you might want to go through the gitter channel to figure out the best way to propose this.
