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#include<iostream>
int main()
{
long t,s;
long long sum=0;
cin>>t;
for(long i=0;i<t;i++)
{
int n;
cin>>n;
int arr[n];
for(long i=0;i<n;i++)
cin>>arr[i];
for(long i=0;i<n;i++)
{
 cin>>s;
 arr[i]=arr[i]*s;
 sum=sum+arr[i];
}
cout<<sum<<"\n";
}
 
 
 
return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:6:1: error: ‘cin’ was not declared in this scope
 cin>>t;
 ^~~
prog.cpp:6:1: note: suggested alternative:
In file included from prog.cpp:1:0:
/usr/include/c++/6/iostream:60:18: note:   ‘std::cin’
   extern istream cin;  /// Linked to standard input
                  ^~~
prog.cpp:20:1: error: ‘cout’ was not declared in this scope
 cout<<sum<<"\n";
 ^~~~
prog.cpp:20:1: note: suggested alternative:
In file included from prog.cpp:1:0:
/usr/include/c++/6/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~

Standard output is empty