/in/foo.cc: In function 'int main()':
/in/foo.cc:10:2: error: 'cin' was not declared in this scope
  cin>>W>>V>>n;
  ^~~
/in/foo.cc:18:59: error: 'max' was not declared in this scope
      f[i][j][k]=max(f[i][j][k],f[i+1][j-w[i]][k-v[i]]+p[i]);
                                                           ^
/in/foo.cc:21:2: error: 'cout' was not declared in this scope
  cout<<f[1][W][V]<<endl;
  ^~~~
/in/foo.cc:21:20: error: 'endl' was not declared in this scope
  cout<<f[1][W][V]<<endl;
                    ^~~~