Instead of algorithms and math, I'll be doing something completely different here. There is something that has bothered me for a long time: people not understanding the tools they use to participate in contests and thus failing to take real advantage of them. And it all goes back to not understanding the command line.
Some of you might say, "well surely, the command line is something obsolete and you're only clinging to it because you [insert ridiculous amateur-psychology here]?" No! The command line is not obsolete, and unless competitive programming becomes so mainstream that software vendors start writing professional-grade tools aimed specifically at us, it won't be.