Added an array problem

Array/subarraySum.cpp

@@ -0,0 +1,57 @@
+//Given an unsorted array A of size N that contains only non-negative integers, find a continuous sub-array which adds to a given number S.
+
+#include <bits/stdc++.h>
+using namespace std;
+
+
+ // } Driver Code Ends
+class Solution
+{
+    public:
+    //Function to find a continuous sub-array which adds up to a given number.
+    vector<int> subarraySum(int arr[], int n, long long s)
+    {
+        int sum=0,i=0,j=0;
+    while((i<n) && (j<=n)){
+           if(sum<s){
+             sum+=arr[j];
+             j++;
+         }
+         else if(sum>s){
+             sum-=arr[i];
+             i++;
+         }
+         else if(sum==s){
+         return {i+1,j};
+         break;
+         }
+    } 
+    return {-1};
+    }
+};
+int main()
+ {
+    int t;
+    cin>>t;
+    while(t--)
+    {
+        int n;
+        long long s;
+        cin>>n>>s;
+        int arr[n];
+        const int mx = 1e9;
+        for(int i=0;i<n;i++)
+        {
+            cin>>arr[i];
+        }
+        Solution ob;
+        vector<int>res;
+        res = ob.subarraySum(arr, n, s);
+
+        for(int i = 0;i<res.size();i++)
+            cout<<res[i]<<" ";
+        cout<<endl;
+
+    }
+	return 0;
+}