Advent of Code 2020 Day 13

This is a walkthrough of the Advent of Code 2020 Day 13: Shuttle Search in JavaScript.

[QueengirlStar]

This channel continues to blow my mind how understandable complex problem can get with a really pedagogic teacher. Alvin is amazing!

[viniciusrolandcrisci]

this explanation was great! thanks for the videos!

[lupanama]

may I know how do you know this trick (part 2) ? is this kinda famous trick or you figure it out yourself? I am able to brute force it and get all the correct answer for the example puzzle set. but I was not able to solve with my own puzzle with my algorithm since the number is so large. I just wonder how people able to think about something like this

[samuelowens]

could you explain why multiplying the stepsize by each bus ID works, I get the algorithm but I dont quite understand why it works