Coding Challenges - Dlang or Generic

[TheZipCreator]

On Tuesday, 10 January 2023 at 00:17:18 UTC, Paul wrote:
> Greetings Dlang-ers
> I was wondering if anyone knew of any coding challenges 
> available where the input and output are specified and its left 
> to the programmer to find a solution?  Free would be nice but 
> even paid services would be worth considering.  I'm taking a D 
> class right now and it has little challenges in the lessons 
> where much of the work is done for you, but I'm thinking of a 
> site/service that is dedicated to these types of challenges 
> (without doing any work for you).
>
> [...]

while not specifically D-related, the code golf stack exchange is 
good place to find challenges (even if you're not golfing).