foo.cc: In function 'int main()':
foo.cc:10:7: error: 'ifx' was not declared in this scope
  sort(ifx,x+n);
       ^~~
foo.cc:11:15: error: expected ';' before '<' token
  for(int i=0,i<n;i++)
               ^
foo.cc:11:15: error: expected primary-expression before '<' token
foo.cc:20:36: error: reference to 'min' is ambiguous
       if(abs(double(x[j])-goal[i])<min)
                                    ^~~
foo.cc:5:21: note: candidates are: double min
 double goal[100001],min=10000.0;
                     ^~~
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 foo.cc:1:
/usr/include/c++/6/bits/stl_algo.h:3453:5: note:                 template<class _Tp, class _Compare> _Tp std::min(std::initializer_list<_Tp>, _Compare)
     min(initializer_list<_Tp> __l, _Compare __comp)
     ^~~
/usr/include/c++/6/bits/stl_algo.h:3447:5: note:                 template<class _Tp> _Tp std::min(std::initializer_list<_Tp>)
     min(initializer_list<_Tp> __l)
     ^~~
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 foo.cc:1:
/usr/include/c++/6/bits/stl_algobase.h:243:5: note:                 template<class _Tp, class _Compare> const _Tp& std::min(const _Tp&, const _Tp&, _Compare)
     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^~~
/usr/include/c++/6/bits/stl_algobase.h:195:5: note:                 template<class _Tp> const _Tp& std::min(const _Tp&, const _Tp&)
     min(const _Tp& __a, const _Tp& __b)
     ^~~
foo.cc:22:8: error: reference to 'min' is ambiguous
        min=abs(double(x[j])-goal[i]);
        ^~~
foo.cc:5:21: note: candidates are: double min
 double goal[100001],min=10000.0;
                     ^~~
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 foo.cc:1:
/usr/include/c++/6/bits/stl_algo.h:3453:5: note:                 template<class _Tp, class _Compare> _Tp std::min(std::initializer_list<_Tp>, _Compare)
     min(initializer_list<_Tp> __l, _Compare __comp)
     ^~~
/usr/include/c++/6/bits/stl_algo.h:3447:5: note:                 template<class _Tp> _Tp std::min(std::initializer_list<_Tp>)
     min(initializer_list<_Tp> __l)
     ^~~
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 foo.cc:1:
/usr/include/c++/6/bits/stl_algobase.h:243:5: note:                 template<class _Tp, class _Compare> const _Tp& std::min(const _Tp&, const _Tp&, _Compare)
     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^~~
/usr/include/c++/6/bits/stl_algobase.h:195:5: note:                 template<class _Tp> const _Tp& std::min(const _Tp&, const _Tp&)
     min(const _Tp& __a, const _Tp& __b)
     ^~~