jethro's point is well taken... and to take it one (possibly irrelevant) step further (because these snippets to review smell a lot like homework; a take-home quiz; or job interview testing):

If you get the job because we gave you the answers, you won't keep it for long... deservedly!

And re your hesitance at introducing warnings and strict, were I still interviewing and handing out code like this for "review," applicants who failed to add strict and warnings would fall far down the preference list.

Oh, yes; my candidates got extra points off for inability to spell things like "pieces."