DiagonalDifference

DiagonalDifference

object Solution {

  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in);
    var n = sc.nextInt();
    var a = Array.ofDim[Int](n, n);
    for (a_i <- 0 to n - 1) {
      for (a_j <- 0 to n - 1) {
        a(a_i)(a_j) = sc.nextInt();
      }
    }

    val v1 = (for (i <- 0 to n - 1; j <- 0 to n - 1 if i == j) yield a(i)(j)).sum
    val v2 = (for (i <- 0 to n - 1; j <- n-1 to 0 by -1 if i + j == n - 1) yield a(i)(j)).sum
    println(math.abs(v1 - v2))

  }
}