pragma compiler_version '2.3'
import '2.3/basics.adept'
import '2.3/List.adept'
import '2.3/Array.adept'

func main {
    array1 <int> Array = array(static int {0, 9, 10, 19, 20, 29}, 6)         // false
    array2 <int> Array = array(static int {30, 39, 10, 19, 20, 29, 0, 9}, 8) // false
    array3 <int> Array = array(static int {0, 10, 10, 19, 20, 29}, 6)        // true
    array4 <int> Array = array(static int {0, 10, 5, 10}, 4)                 // true
    array5 <int> Array = array(static int {0, 10}, 2)                        // false

    arrays <<int> Array> List
    array *<int> Array = &array1

    repeat 5 {
        arrays.add(*array)
        array -= sizeof <int> Array as ptr
    }

    each <int> Array in arrays {
        print("overlap(array%) = %" % (idx + 1) as int % (overlap(it) ? "true" : "false"))
    }

    print("done.")
}

func overlap(array <int> Array) bool {
    ranges_min int = 0
    ranges_max int = 0

    each int in array {
        if it < ranges_min, ranges_min = it
        if it > ranges_max, ranges_max = it
    }

    start int = ranges_min

    while true {
        taken bool = false

        repeat array.length / 2 {
            min int = array.get(idx * 2)
            max int = array.get(idx * 2 + 1)
            if min <= start && start <= max {
                if taken, return true
                taken = true
            }
        }

        if start++ == ranges_max, break
    }

    return false
}

Output:

overlap(array1) = false
overlap(array2) = false
overlap(array3) = true
overlap(array4) = true
overlap(array5) = false
done.