Buld and Run

make run-x-y

where x is the day and y is the part

Build

make src/x-y

where x is the day and y is the part

Build all

make

Run With custom input

make run-stdin-x-y < input_file

where x is the day and y is the part

Run Executable Directly

src/x-y < input file

this does not automatically rebuild when the code changes