Sample doubt sample doubt

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#include <math.h>
using namespace std;
int main()
{
int n,r=0,s=0,sum=0,h=0,sum1[3000],m;
cin>>n;
int arr1[n];
for(int i=0;i<n;i++)
cin>>arr1[i];
cin>>m;
int arr2[m];
for(int i=0;i<m;i++)
cin>>arr2[i];
for(int i=0,k=n-1;i<n && k>=0;i++,–k)
{
r+=(arr1[i]*pow(10,k));
}
for(int i=0 , k=m-1 ; i<m && k>=0 ; ++i,–k)
{
s+=(arr2[i]*pow(10,k));
}
sum=r+s;
while(sum>0)
{
sum1[h]=sum%10;
sum=sum/10;
++h;
}
for(int i=0;i<h;i++)
cout<<sum1[i]<<", ";
cout<<β€œEND”;

}