First version of diagonal difference working

src/main/scala/algorithms/DiagonalDifference/package.scala

@@ -0,0 +1,34 @@
+package algorithms.DiagonalDifference
+
+/**
+  * Created by jll on 3/27/2017.
+  */
+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();
+      }
+    }
+
+    print(Math.abs(sumOfDiag(a, n) - sumOfDiag(mirror(a), n)))
+  }
+
+  def sumOfDiag(arr: Array[Array[Int]], dim: Int)= {
+    var idx = 0
+    var out = 0
+    while (idx < dim) {
+      out += arr(idx)(idx)
+      idx += 1
+    }
+    out
+  }
+
+  def mirror(arr: Array[Array[Int]]) =
+    arr.map(x => x.reverse)
+
+}