Create Additive sequence

Additive sequence

@@ -0,0 +1,98 @@
+//Additive sequence
+
+import java.util.*;
+
+public class GFG {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int t = sc.nextInt();
+
+        while(t-- > 0) {
+            String s = sc.next();
+            Solution ss = new Solution();
+            boolean result = ss.isAdditiveSequence(s);
+            System.out.println((result == true ? 1 : 0));
+        }
+        sc.close();
+    }
+}
+
+class Solution {
+
+    static String findSum(String a, String b){
+        int i = a.length() - 1, j = b.length() - 1;
+        StringBuilder ans = new StringBuilder();
+        int carry = 0;
+
+        while(i >= 0 && j >= 0) {
+            int sum = (a.charAt(i) - '0') + (b.charAt(j) - '0') + carry;
+            ans.append((char)sum % 10);
+            carry = sum / 10;
+            i--;
+            j--;
+        }
+
+        while(i >= 0) {
+            int sum = (a.charAt(i) - '0') + carry;
+            ans.append((char)sum % 10);
+            carry = sum / 10;
+            i--;
+        }
+
+        while(j >= 0) {
+            int sum = (b.charAt(j) - '0') + carry;
+            ans.append((char)sum % 10);
+            carry = sum / 10;
+            j--;
+        }
+
+        if(carry != 0) {
+            ans.append((char)(carry + '0'));
+        }
+
+        StringBuilder temp = ans.reverse();
+
+        return temp.toString();
+    }
+
+    static boolean help(String a, String b, String c) {
+        String sum = findSum(a, b);
+        int i = 0, j = 0;
+
+        while(i < c.length() && j < sum.length()) {
+            if(c.charAt(i) != sum.charAt(j)) {
+                return false;
+            }
+
+            i++;
+            j++;
+        }
+
+        if(j != sum.length()) {
+            return false;
+        }
+
+        if(i == c.length()) {
+            return true;
+        }
+
+        c = c.substring(i);
+
+        return help(b, sum, c);
+    }
+
+    public boolean isAdditiveSequence(String n) {
+        for(int i = 0; i < n.length() / 2; i++) {
+            for(int j = i + 1; j < n.length() - 1; j++) {
+                String a = n.substring(0, i + 1);
+                String b = n.substring(i + 1, j + 1);
+                String c = n.substring(j + 1);
+                if(help(a, b, c)) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+}