func part1_is_invalid_id[s: str] : bool
    len := s->len()
    if len % 2 != 0
        return false

    first := s->substr(0, len / 2)
    second := s->substr(len / 2, len / 2)

    return first->equal(second)

func part1[ranges: Array] : void
    sum := 0

    for i in 0..ranges->size
        parts := (ranges->nth(i) as str)->split("-")
        start := (parts->nth(0) as str)->parse_i64()
        end := (parts->nth(1) as str)->parse_i64()

        for n in (start)..end+1
            if part1_is_invalid_id(n->to_str())
                sum += n
    
    io.println_i64(sum)

// had to cheat this one
func part2_is_invalid_id[s: str] : bool
    len := s->len()
    if len < 2
        return false
    for div in 1..(len / 2 + 1)
        if len % div == 0
            u := s->substr(0, div)
            is_repeat := true
            for k in 1..(len / div)
                segment := s->substr(k * div, div)
                if !segment->equal(u)
                    is_repeat = false
            if is_repeat
                return true
    return false

func part2[ranges: Array] : void
    sum := 0

    for i in 0..ranges->size
        parts := (ranges->nth(i) as str)->split("-")
        start := (parts->nth(0) as str)->parse_i64()
        end := (parts->nth(1) as str)->parse_i64()

        for n in (start)..end+1
            if part2_is_invalid_id(n->to_str())
                sum += n
    
    io.println_i64(sum)

func main[] : i64
    ~input, ok := io.read_text_file("input.txt")
    if !ok
        panic("failed to open input.txt")
    
    ranges := input->split(",")

    part1(ranges)
    part2(ranges)