/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: 'cin' was not declared in this scope
  cin>>m>>n;
  ^~~
/in/foo.cc:16:38: error: 'max' was not declared in this scope
     dp[j] = max(dp[j],dp[j-A[i]]+V[i]);
                                      ^
/in/foo.cc:19:24: error: 'max' was not declared in this scope
   maxn = max(maxn,dp[i]);
                        ^
/in/foo.cc:21:2: error: 'cout' was not declared in this scope
  cout<<maxn<<endl;
  ^~~~
/in/foo.cc:21:14: error: 'endl' was not declared in this scope
  cout<<maxn<<endl;
              ^~~~