Create Intersection

Author: Ritik2604

DataStructures/HashMap/Hashing/Intersection

@@ -0,0 +1,37 @@
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+import java.util.Set;
+
+public class Intersection {
+
+	public static ArrayList Main(int arr[],int arr2[]) {
+		HashMap<Integer,Integer> hmap=new HashMap<>();
+		HashMap<Integer,Integer> hmap2=new HashMap<>();
+		for(int i=0;i<arr.length;i++) {
+			if(hmap.containsKey(arr[i])) {
+				int val=hmap.get(arr[i]);
+				hmap.put(arr[i],val+1);
+			}else
+				hmap.put(arr[i],1);
+			
+		}
+		ArrayList<Integer> res=new ArrayList<>();
+		for(int i=0;i<arr2.length;i++) {
+			if(hmap.containsKey(arr2[i])&&hmap.get(arr2[i])>0) {
+				int val=hmap.get(arr2[i]);
+				hmap.put(arr2[i],val-1);
+				res.add(arr2[i]);
+			}
+			
+		}
+		return res;
+	}
+	public Intersection() {
+		
+	}
+
+	
+
+}