class ComplexInt(val real: Int, val imag: Int) {
  override def toString =
    real + (if (imag >= 0) "+" else "") + imag + "i"
  def +(other: ComplexInt) =
    new ComplexInt(real + other.real, imag + other.imag)
  def -(other: ComplexInt) =
    new ComplexInt(real - other.real, imag - other.imag)
}
 
object ComplexInt {
  implicit class ComplexIntReal(real: Int) extends ComplexInt(real, 0) {}
}
 
object Main {
  def main(args: Array[String]) {
    val a = new ComplexInt(2, 3)
    println(a)
    println(a - 1) // (2 + 3i) - 1
    println(1 - a) // 1 - (2 + 3i)
  }
}
 

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