Looking for something to flex your programming puzzle skills after Advent of Code? Me too, so I was researching some options.
A perennial favourite in my household, the classic Project Euler is a more mathematics-driven collection of programming puzzles.
If the maths-driven style is not for you, I also have two lists of programming contests: the obligatory Wikipedia category list of programming challenges (some closed, many ongoing), and the comprehensive CLIST ranking of coding puzzles, challenges and competitions.
From here, I came across two which seems to resonate with me, akin to AoC and Project Euler: Sphere Online Judge (SPOJ) and Kattis. I’ll certainly be taking a look.