func part1[l1: Array, l2: Array] : void
    out := 0
    
    for i in 0..l1->size
        out += (l1->nth(i) as i64 - l2->nth(i) as i64)->abs()

    io.println_i64(out)

func part2[l1: Array, l2: Array] : void
    out := 0

    for i in 0..l1->size
        out += l1->nth(i) * l2->count(l1->nth(i))

    io.println_i64(out)

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

    l1 := []
    l2 := []

    for i in 0..lines->size
        line : str = lines->nth(i)
        
        parts := line->split("   ")

        l1->push((parts->nth(0) as str)->parse_i64())
        l2->push((parts->nth(1) as str)->parse_i64())

    l1->quicksort()
    l2->quicksort()

    part1(l1, l2)
    part2(l1, l2)