I recommend Advent of Code to everyone I meet. It is a wonderful way to develop your programming skills, since you’re completely on your own (other sites babysit you quite a bit, methinks). However, while doing the implementation is a great exercise, it is much more useful (especially if learning a new language) to look at what others have done (after solving it ourselves!).

I did about half of AoC in 2019, and figured I’d work on the 2020 edition when I had the time. Well, here we go!

## This Happened…

A Refined Laser Method and Faster Matix Multiplication, ” Josh Alman and Virginia Vassilevska Williams lowers the complexity of matrix multiplication from $n^{2.37287}$ to $n^{2.37286}$

## This Happened…

A (Slightly) Improved Approximation Algorithm for Metric TSP,” Anna R. Karlin, Nathan Klein and Shayan Oveis Gharan presents a 3/2 – $\epsilon$ approximation algorithm, breaking the previous record of 3/2 by $\epsilon \gt 10^{-36}$