Subarray with given sum

Given: Unsorted array 

Find: Subarray starting index  to last index on summing up gives the given sum

arr[] = {1, 4, 20, 3, 10, 5}, sum = 33

C++ Solution

#include <iostream>
#include <cstdio>

using namespace std;

int subwithsum(int arr[],int n, int sum)
{
  
   int curr_sum, i, j;
   for (int i=0; i<n; i++)
   {
     curr_sum=arr[i];
     for (j=i+1; j<=n; j++)
     {
       if(curr_sum==sum)
       {
         cout<<i<<"and"<<j-1;
         return 1;
       }
      
       if(curr_sum>sum || j==n)
         break;
       curr_sum=curr_sum + arr[j];
      
     } 
    
   }
  
   cout<<"no sub array";
   return 0;
}


int main()
{
   int arr[]={3,8,2,1,9};
   int n=5,sum=10;
  
   subwithsum(arr,n,sum);
   return 0;
}