Quest 4: Teeth of the Wind

  • Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
  • You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL

Link to participate: https://everybody.codes/

  • Pyro@programming.dev
    2·
    7 days ago

    Python

    # snipped read_input implementation
data = read_input("input_p3.txt")

# part 1 and 2 can be solved using a calculator 
# with only the first and last gears

def part3(data):
    shafts = data.splitlines()

    rotations = 100 * int(shafts[0])
    for shaft in shafts[1:-1]:
        gear1, gear2 = [int(g) for g in shaft.split('|')]
        rotations *= gear2 / gear1
    rotations /= int(shafts[-1])
    
    return int(rotations)

assert part3("""5
7|21
18|36
27|27
10|50
10|50
11""") == 6818

print(part3(data))
    • reboot6675@sopuli.xyz
      2·
      3 days ago

      Ohh so it was possible to use floats for this! I was “worried” that it would lead to precision errors haha so I ended up “cheating” with BigInt (Golang) to make all the multiplications first and one division at the end

      • Pyro@programming.dev
        2·
        3 days ago

        Yeah, it may be possible for precision errors to accumulate in my solution but for EC the inputs are few enough that it doesn’t really matter. Maybe I got a little lucky with my input too.