' FB 1.05.0 Win64

Dim As Integer seq(10) = {-1 , -2 , 3 , 5 , 6 , -2 , -1 , 4 , -4 , 2 , -1}
Dim As Integer i, j, sum, maxSum, first, last

maxSum = 0

For i = LBound(seq) To UBound(seq)
  sum = 0
  For j = i To UBound(seq)
    ' only proper sub-sequences are considered
    If i = LBound(seq) AndAlso j = UBound(seq) Then Exit For
    sum += seq(j)
    If sum > maxSum Then
      maxSum = sum
      first = i
      last = j
    End If
  Next j
Next i

If maxSum > 0 Then
  Print "Maximum subsequence is from indices"; first; " to"; last
  Print "Elements are : ";
  For i = first To last
    Print seq(i); " ";
  Next
  Print
  Print "Sum is"; maxSum
Else
  Print "Maximum subsequence is the empty sequence which has a sum of 0"
End If

Print
Print "Press any key to quit"
Sleep