Actually just competitive programming.

Alex's Anthology of Algorithms:
Common Code for Contests in Concise C++

A (not so concisely named) collection of concisely implemented algorithms and data structures in C++.

PEG Judge
Meta Hacker Cup

You'll find my problem-setting contributions starting from the 2020 season.

Visit the  contest site or like us on  Facebook.

PEG Judge
PEG Online Judge

A site of historical significance for me and many Canadian gurus. The entire archive (including hundreds of our original problems) has migrated to DMOJ.

Visit the judge at and DMOJ at

Woburn Challenge

A tradition of my high school club since the 90s, which a few alumni and I helped relaunch in 2015 for high school enrichment.

Visit or like us on  Facebook.