Advent of Code 2023 Day 5

I placed 64th on part 1; 11th on part 2; now 5th overall. Lost track of time and started 44 seconds late. Oops. It went pretty well, considering. I m surprised to see a problem as tricky as part 2 already. I find interval math tough to visualize. It s a longer video today because I spent a while cleaning up and explaining my solution code. Hopefully that s interesting and, or useful. I recommend using inclusive on the left, exclusive on the right to represent intervals e. g. store 1, 2, 3 as 1, 4). This has some nice properties, like the length of a, b) is ba and a, b) + b, c) a, c). Solution: Problem: