Code for Two_Sum added

Author: siddhant2002

Programs/Two_Sum.java

@@ -0,0 +1,47 @@
+//In this code a array is taken along with an target element. The sum of two elements matching with the target element is displayed
+
+
+import java.util.*;
+public class Two_Sum {
+    public static void main(String args[])
+    {
+        try (Scanner sc = new Scanner(System.in)) {
+            int n = sc.nextInt();
+            // length of the array is taken
+            int a[] = new int[n];
+            for(int i = 0; i < n; i++)
+            {
+                a[i] = sc.nextInt();
+            }
+            int target=sc.nextInt();
+            // target value is initialzized
+            int array[] = new int[2];
+            a=twoSum(array,target);
+            // method is called
+            for(int i=0;i<2;i++)
+            {
+                System.out.print(a[i]+" ");
+            }
+            System.out.println();
+        }
+    }
+    public static int[] twoSum(int[] n, int target) {
+        Map<Integer,Integer> nm=new HashMap<>();
+        // hashmap is created to store the array elements
+        int array[]=new int[2];
+        int k=n.length;
+        for(int i=0;i<k;i++)
+        {
+            if(nm.containsKey(target-n[i]))
+            {
+                array[0]=nm.get(target-n[i]);
+                array[1]=i;
+                break;
+                // The sum of the elements equals to the target is storee
+            }
+            nm.put(n[i],i);
+        }
+        return array;
+        // the answer array is returned
+    }
+}