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I have a deep love of A* because it was the first complex algorithm I fully understood. In my first data structures and algorithms in college (early 2000's), we had to pick an algorithm to study, code, and write a paper on and I picked A*.

I spent hours painstakingly drawing similar grids that the author of this article made and manually doing the calculations [0]. I still have these notes somewhere, even though they're over 20 years old at this point, because I was so proud of the work I put into it.

At any rate, thanks for this article and the trip down memory lane.

[0] https://imgur.com/a/zRYaodL (apologies for the Imgur link)