with javascript_semantics
function maxSubseq(sequence s)
    integer maxsum = 0, first = 1, last = 0
    for i=1 to length(s) do
        integer sumsij = 0
        for j=i to length(s) do
            sumsij += s[j]
            if sumsij>maxsum then
                {maxsum,first,last} = {sumsij,i,j}
            end if
        end for
    end for
    return s[first..last]
end function
? maxSubseq({-1, -2, 3, 5, 6, -2, -1, 4, -4, 2, -1})
? maxSubseq({})
? maxSubseq({-1, -5, -3})