function equindex2pass(data::Array)
    rst = Vector{Int}(0)
    suml, sumr, ddelayed = 0, sum(data), 0
    for (i, d) in enumerate(data)
        suml += ddelayed
        sumr -= d
        ddelayed = d
        if suml == sumr
            push!(rst, i)
        end
    end
    return rst
end

@show equindex2pass([1, -1, 1, -1, 1, -1, 1])
@show equindex2pass([1, 2, 2, 1])
@show equindex2pass([-7, 1, 5, 2, -4, 3, 0])