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This is the code to count inversion problem.

Author: RashidNepal

GeeksForGeeks/Inversion_Count.java

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+import java.util.Scanner;
+
+public class Inversion_Count {
+    public static int[] input() {
+        System.out.println("Enter size of array: ");
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        int a[] = new int[n];
+        for (int i = 0; i < n; i++) {
+            a[i] = sc.nextInt();
+        }
+        return a;
+
+    }
+    
+        public static void inversecount(int a[]) {
+            int count=0;
+            for(int i=0;i<a.length;i++){
+                for(int j=i+1;j<a.length;j++)
+                if(a[i]>a[j]){
+                    int temp=a[i];
+                    a[i]=a[j];
+                    a[j]=temp;
+                    count++;
+                }
+            }
+            System.out.println("The Answer is: ");
+            System.out.println(count);
+        }
+    public static void main(String[] args) {
+        
+        Scanner sc=new Scanner(System.in);
+        System.out.println("Enter number of test cases you want to perform: ");
+        int t = sc.nextInt();
+        for (int p = 0; p < t; p++) {
+            int a[] = input();
+            inversecount(a);
+          
+        }
+    }
+}