/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: 'cin' was not declared in this scope
  cin>>m>>n;
  ^~~
/in/foo.cc:7:2: note: suggested alternative:
In file included from /in/foo.cc:2:0:
/usr/include/c++/6/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
/in/foo.cc:17:38: error: 'max' was not declared in this scope
     dp[j] = max(dp[j],dp[j-A[i]]+V[i]);
                                      ^
/in/foo.cc:17:38: note: suggested alternative:
In file included from /usr/include/c++/6/bits/char_traits.h:39:0,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:2:
/usr/include/c++/6/bits/stl_algobase.h:265:5: note:   'std::max'
     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^~~
/in/foo.cc:20:24: error: 'max' was not declared in this scope
   maxn = max(maxn,dp[i]);
                        ^
/in/foo.cc:20:24: note: suggested alternative:
In file included from /usr/include/c++/6/bits/char_traits.h:39:0,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:2:
/usr/include/c++/6/bits/stl_algobase.h:265:5: note:   'std::max'
     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^~~
/in/foo.cc:22:2: error: 'cout' was not declared in this scope
  cout<<maxn<<endl;
  ^~~~
/in/foo.cc:22:2: note: suggested alternative:
In file included from /in/foo.cc:2:0:
/usr/include/c++/6/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~
/in/foo.cc:22:14: error: 'endl' was not declared in this scope
  cout<<maxn<<endl;
              ^~~~
/in/foo.cc:22:14: note: suggested alternative:
In file included from /usr/include/c++/6/iostream:39:0,
                 from /in/foo.cc:2:
/usr/include/c++/6/ostream:590:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^~~~