Question

How to check if a matrix rows contain numbers without repetition in Scala

Answer 1

object MatrixCheck {
  def rowsHaveUniqueNumbers(matrix: Array[Array[Int]]): Boolean = {
    matrix.forall(row => row.distinct.length == row.length)
  }

  def main(args: Array[String]): Unit = {
    val matrix1 = Array(
      Array(1, 2, 3),
      Array(4, 5, 6),
      Array(7, 8, 9)
    )

    val matrix2 = Array(
      Array(1, 2, 3), 
      Array(4, 5, 6),
      Array(7, 8, 8) // 8, 8
    )

    println(rowsHaveUniqueNumbers(matrix1)) 
    println(rowsHaveUniqueNumbers(matrix2)) 
  }
}



 
/*
run:

true
false

*/

 

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