Create Partitions with given difference

Partitions with given difference

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+//Partitions with given difference
+
+import java.io.*;
+import java.util.*;
+
+class IntArray {
+    public static int[] input(BufferedReader br, int n) throws IOException {
+        String[] s = br.readLine().trim().split(" ");
+        int[] a = new int[n];
+
+        for(int i = 0; i < n; i++)
+            a[i] = Integer.parseInt(s[i]);
+
+        return a;
+    }
+
+    public static void print(int[] a) {
+        for(int e : a)
+            System.out.print(e + " ");
+        System.out.println();
+    }
+
+    public static void print(ArrayList<Integer> a) {
+        for(int e : a)
+            System.out.print(e + " ");
+        System.out.println();
+    }
+}
+
+class GFG {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int t = Integer.parseInt(br.readLine());
+
+        while(t-- > 0) {
+            int n = Integer.parseInt(br.readLine());
+            int d = Integer.parseInt(br.readLine());
+            int[] arr = IntArray.input(br, n);
+            Solution obj = new Solution();
+            int res = obj.countPartitions(n, d, arr);
+            System.out.println(res);
+        }
+    }
+}
+
+class Solution {
+    static int mod = 1000000007;
+
+    static int help(int n, int d, int[] arr, int sum, int temp, int index, int dp[][]) {
+        if(sum - temp - temp < d) {
+            return 0;
+        }
+
+        if(index == n) {
+            int secondSum = sum - temp;
+
+            if(secondSum - temp == d) {
+                return 1;
+            }
+
+            return 0;
+        }
+
+        if(dp[index][temp] != -1) {
+            return dp[index][temp];
+        }
+
+        int a = help(n, d, arr, sum, temp, index + 1, dp);
+        int b = help(n, d, arr, sum, temp + arr[index], index + 1, dp);
+
+        return dp[index][temp] = (a + b) % mod;
+    }
+
+    public static int countPartitions(int n, int d, int[] arr) {
+        int sum = 0;
+
+        for(int i = 0; i < n; i++) {
+            sum += arr[i];
+        }
+
+        int dp[][] = new int[n][sum + 1];
+
+        for(int x[] : dp) {
+            Arrays.fill(x, -1);
+        }
+
+        return help(n, d, arr, sum, 0, 0, dp);
+    }
+}