Remove all negative numbers in the array except for the first negative number

Learn more about Scala, and the advantages are tedious. Applying arrays is a lot simpler than the difference set.
scala> val arr = Array (1,2,3,4,5,-1,6,-2,7,-3,8,-4,9,-5)
Arr:array[int] = Array (1, 2, 3, 4, 5,-1, 6,-2, 7,-3, 8,-4, 9,-5)

Scala> val r = Arr.filter (_ < 0)
R:array[int] = Array (-1,-2,-3,-4,-5)

Scala> Arr.diff (R.tail)
Res0:array[int] = Array (1, 2, 3, 4, 5,-1, 6, 7, 8, 9)

Remove all negative numbers in the array except for the first negative number