You can just start from the code snippets in C++/Java below the statement and implement the method stubs. We initially had an explanation on x,y,z, but in the e

You can just start from the code snippets in C++/Java below the statement and implement the method stubs. We initially had an explanation on x,y,z, but in the end realized its safer to explicitly force people to copy/paste those pieces of code, to not accidentally mis-implement anything.