/in/foo.cc: In function 'int main()':
/in/foo.cc:35:2: error: 'vector' was not declared in this scope
  vector<double> v;
  ^~~~~~
/in/foo.cc:35:9: error: expected primary-expression before 'double'
  vector<double> v;
         ^~~~~~
/in/foo.cc:40:4: error: 'v' was not declared in this scope
    v.push_back(r);
    ^
/in/foo.cc:45:5: error: 'v' was not declared in this scope
     v.push_back(i);   
     ^
/in/foo.cc:52:33: error: 'v' was not declared in this scope
   cout<<fixed<<setprecision(2)<<v.at(i)<<" ";
                                 ^