This has all my solution programs for Advent of Code 2021 (still a work in progress!). If you don't know what Advent of Code is, here you go: https://adventofcode.com. If you know it but haven't tried it out yet, I highly recommend that you do. The fun in it is unimaginable.
These are the programming languages I used in my solutions:
i. Python -> Day 1, Day 3/A
ii. C++ -> Day 2
iii. Rust -> Day 3/B, Day 4