rmNotFirstNegative.scala

object Test extends App {
  val a = Array(10, 9, -1, 8, -2, -100, 1000).toBuffer
  var first = true
  val indexes = for (i <- 0 until a.length if first || a(i) >= 0) yield {
    if (a(i) < 0) 
      first = false
    i
  }
  for(j <- 0 until indexes.length)
    a(j) = a(indexes(j))
  a.trimEnd(a.length - indexes.length)
  for(ele <- a) println(ele)
}