I never knew there was a min function on iter, so short and clever

I forgot about iterators on the array. I need to stop thinking of Rust arrays as C style arrays. I converted my array to a vec first but essentially my solution was the same.

Ah, this is so much cleaner than mine. I love it.

I like this solution alot, I thought some thing like this was possible, but my Rust-foo is not strong enough and I have a hard time navigating the documentation to dig up the idiomatic Rust examples

I think that in your case the comments don't make the code easier to read and understand otherwise your solution is clean. Maybe just less efficient since you used a dict instead of a set.
Also you did the same "mistake" i did, you can get rid of the else statment because you always want to add the checked value.

Mine isn't as clean as yours, but it's nice to see that I came close! Awesome solution.

Thanks for this. After I submitted mine I figured I could have just sorted...

I'm having trouble with these in Python. Attempting the List Filtering kata. My function works fine, but the test object is funny.

AttributeError: 'module' object has no attribute 'assertEquals'