gistfile1.txt

def solve01b(fname: str):

    with open(fname, 'r') as f:

        pos = 50
        zeroCount = 0
        n = 0
        for line in f:
            direction = line[0]
            distance = int(line[1:].strip())

            if direction == 'L':
                mod = (pos - distance) % 100
                needed = pos if pos > 0 else 100

                    
            elif direction == 'R':
                mod = (pos + distance) % 100 
                needed = 100 - pos

            if distance >= needed:
                zeroCount += (distance - needed) // 100 + 1

            pos = mod

            n += 1


            
        print(f"Final position: {pos}, n={n}")
        print(f"Zero count: {zeroCount}")