/in/foo.cc: In function 'int main()':
/in/foo.cc:19:67: error: no matching function for call to 'max(__gnu_cxx::__alloc_traits<std::allocator<long long int> >::value_type&, __gnu_cxx::__promote_2<int, long long int, double, double>::__type)'
      dp[i][g] = max(dp[i][g], dp[i][k] + dp[k+1][g] + pow(2,g-i-1));
                                                                   ^
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/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_algobase.h:219:5: note: candidate: template<class _Tp> const _Tp& std::max(const _Tp&, const _Tp&)
     max(const _Tp& __a, const _Tp& __b)
     ^~~
/usr/include/c++/6/bits/stl_algobase.h:219:5: note:   template argument deduction/substitution failed:
/in/foo.cc:19:67: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}')
      dp[i][g] = max(dp[i][g], dp[i][k] + dp[k+1][g] + pow(2,g-i-1));
                                                                   ^
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/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_algobase.h:265:5: note: candidate: template<class _Tp, class _Compare> const _Tp& std::max(const _Tp&, const _Tp&, _Compare)
     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^~~
/usr/include/c++/6/bits/stl_algobase.h:265:5: note:   template argument deduction/substitution failed:
/in/foo.cc:19:67: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and '__gnu_cxx::__promote_2<int, long long int, double, double>::__type {aka double}')
      dp[i][g] = max(dp[i][g], dp[i][k] + dp[k+1][g] + pow(2,g-i-1));
                                                                   ^
In file included from /usr/include/c++/6/algorithm:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:65,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_algo.h:3459:5: note: candidate: template<class _Tp> _Tp std::max(std::initializer_list<_Tp>)
     max(initializer_list<_Tp> __l)
     ^~~
/usr/include/c++/6/bits/stl_algo.h:3459:5: note:   template argument deduction/substitution failed:
/in/foo.cc:19:67: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
      dp[i][g] = max(dp[i][g], dp[i][k] + dp[k+1][g] + pow(2,g-i-1));
                                                                   ^
In file included from /usr/include/c++/6/algorithm:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:65,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_algo.h:3465:5: note: candidate: template<class _Tp, class _Compare> _Tp std::max(std::initializer_list<_Tp>, _Compare)
     max(initializer_list<_Tp> __l, _Compare __comp)
     ^~~
/usr/include/c++/6/bits/stl_algo.h:3465:5: note:   template argument deduction/substitution failed:
/in/foo.cc:19:67: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
      dp[i][g] = max(dp[i][g], dp[i][k] + dp[k+1][g] + pow(2,g-i-1));
                                                                   ^
/in/foo.cc:23:12: error: 'i' was not declared in this scope
   ans += a[i];
            ^