func lis(a) {
    var l = a.len.of { [] }
    l[0] << a[0]
    for i in (1..a.end) {
        for j in ^i {
            if ((a[j] < a[i]) && (l[i].len < l[j].len+1)) {
                l[i] = [l[j]...]
            }
        }
        l[i] << a[i]
    }
    l.max_by { .len }
}

say lis(%i<3 2 6 4 5 1>)
say lis(%i<0 8 4 12 2 10 6 14 1 9 5 13 3 11 7 15>)