Your restrictions sound quite challenging, good luck! Last year I solved all the problems in C without external libraries [1] and I enjoyed it a lot. It forced

Your restrictions sound quite challenging, good luck! Last year I solved all the problems in C without external libraries [1] and I enjoyed it a lot. It forced me implement some low-level stuff that I had forgotten how to do (e.g. a heap) and to write some numerical routines myself (easier than you'd think!). [1] https://github.com/sebastianotronto/aoc/tree/master/2023 https://github.com/sebastianotronto/aoc/tree/master/2023