Added solution for diagonal difference problem

Author: amit-kumar-sain

HackerRank/DiagonalDifference.java

@@ -0,0 +1,25 @@
+package com.saintech.allprogtutorials.hackerrank.algos;
+
+import java.util.Scanner;
+
+/**
+ * @author Sain Technology Solutions
+ *
+ * Solution to Problem - https://www.hackerrank.com/challenges/diagonal-difference
+ */
+public class DiagonalDifference {
+	
+	public static void main(String[] args) {
+		Scanner in = new Scanner(System.in);
+		final int N = Integer.parseInt(in.nextLine());
+		long diff = 0;
+		for(int i=0; i < N; i++) {
+			String[] row = in.nextLine().split(" ");
+			diff += (Integer.parseInt(row[i]) - Integer.parseInt(row[N - 1 - i]));
+		}
+		
+		System.out.println(Math.abs(diff));
+		
+		in.close();
+	}
+}