func part1[lines: Array] : void
    password := 0
    dial := 50

    for i in 0..lines->size
        line : str = array.nth(lines, i)
        dir := line[0]
        n := str.substr(line, 1, str.len(line) - 1) |> str.parse_i64()

        if dir == 'L'
            dial -= n
            while dial < 0
                dial += 100
        else
            dial += n
            while dial >= 100
                dial -= 100

        if dial == 0
            password += 1
    
    io.println_i64(password)

func part2[lines: Array] : void
    password := 0
    dial := 50

    for i in 0..lines->size
        line : str = array.nth(lines, i)
        dir := line[0]
        n := str.substr(line, 1, str.len(line) - 1) |> str.parse_i64()

        if dir == 'L'
            for i in 0..n
                dial -= 1
                if dial == 0
                    password += 1
                if dial == -1
                    dial = 99
        else
            for i in 0..n
                dial += 1
                if dial == 100
                    dial = 0
                    password += 1
    
    io.println_i64(password)

func main[] : i64
    ~input, ok := io.read_text_file("input.txt")
    if !ok
        panic("failed to open input.txt")
    
    lines := str.split(input, "\n")

    part1(lines)
    part2(lines)