The 'trickonometry' of math olympiad inequalities

Not to the specific topic of the article ("inequalities"), but seeing the nationality of the author and source of some of the examples, reminded me of the high school I attended, in the late 70s, when - in order to pass the class - one had to have a minimum of points obtained by sending solutions to problems printed in "Gazeta Matematica" (Math Journal), and - in order to get a grade above a certain level - to qualify for the second stage of the Math Olympics. Let alone the amount of proven practice during each summer vacation. Can't say this didn't help getting two masters and a PhD later ;-)