diff --git a/04.04.2024.cpp b/04.04.2024.cpp
new file mode 100644
index 0000000..26896d6
--- /dev/null
+++ b/04.04.2024.cpp
@@ -0,0 +1,21 @@
+class Solution
+{
+    public:
+    //Function to find sum of all possible substrings of the given string.
+    long long sumSubstrings(string s){
+        
+        // your code here
+        long  long prev=0, curr=0, ans=0;
+        long long mod=1e9+7;
+        
+        for(int i=0;i<s.length();i++){
+            curr=(s[i]-'0')*(i+1) + prev*10;
+            curr%=mod;
+            ans+=curr;
+            ans%=mod;
+            prev=curr;
+        }
+        
+        return ans;
+    }
+};