I don't think this is true; the whole point of Rust is that unsafe operations are explicit, not that you never do so.

Also, I looked at the first one, and it's only using unsafe on what are basically op code calls; I don't think it is realistic to complain about that.

Of those 4 tasks, the rust programs for task 3 and task 4 do not use the keyword "unsafe".

For task 2, the spectral-norm Rust #6 program does use "unsafe" but #5 does not and it's almost as fast.