XI ostream& operator(v.gym).size();>;> 30 31 32 return os: void vectors::add (string elem) f gym.push back (elem); { gym . size ( ); void vectors: :del (string elem) i++){ (int i = 0; if (gym[i] elem) f for gym[i].erase (): cout\"is> \"vector . h\" vector.h X #include #include 3 using namespace std: 5 int main () vectors v: cout;>