My solutions to the 2019, 2020 and 2021 Advent of Code, in C and Bash.

My own rules :

• C : Only standard libraries (for example, no external sort). However, I may use my own includes and libraries (started in 2021).
• bash: Pure bash only: No external commands allowed (grep, sed, awk, etc...).

Advent of Code 2019

• C: Days 1-9

Advent of Code 2020

• C: Days 1-18
• Bash: Days 1-23
• Cobol: Day 1 (!!)

Advent of Code 2021

• C: Days 1-25