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you'd use a cell/refcell/box or just wouldn't get this excercise as everyone who got past it in rust know it's not easy and critically it's not supposed to be easy.

it's difficult in rust because recurrent data structures are super hard to reason about in general in terms of borrowing and ownership when AOT compiling and you unfortunately must know this to be efficient at rust; this realization is one of the stages of learning the language.

I would argue that's a terrible interview, as anyone who's in the position to give a Rust job should know this about Rust.

I landed a job w/ Rust, and the programming challenge I was given was a simple C programming challenge to implement a parser to parse gzip headers, to which I did it in both C and Rust.

Nobody hiring for a position that's largely Rust is going to ask you to write linked lists, trees, and graphs. They're going to want you to build something more complex & practical.