My implementations for https://protohackers.com/

cargo run -- 0 # run 0th (echo) problem
cargo run -- 3 # run 3rd problem
# etc ...

Port should be 3007, but isn't guaranteed.

Builds single binary to easily move things around between servers. I'll think about building seperate binaries when the binary size crosses 50MB mark (currently it's around 8-9MB)