/in/foo.cc: In function 'int main()':
/in/foo.cc:9:12: error: no matching function for call to 'sort(int [3], int, int)'
  sort(a,0,2);
            ^
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:4697:5: note: candidate: template<class _RAIter> void std::sort(_RAIter, _RAIter)
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
     ^~~~
/usr/include/c++/6/bits/stl_algo.h:4697:5: note:   template argument deduction/substitution failed:
/in/foo.cc:9:12: note:   deduced conflicting types for parameter '_RAIter' ('int*' and 'int')
  sort(a,0,2);
            ^
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:4727:5: note: candidate: template<class _RAIter, class _Compare> void std::sort(_RAIter, _RAIter, _Compare)
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^~~~
/usr/include/c++/6/bits/stl_algo.h:4727:5: note:   template argument deduction/substitution failed:
/in/foo.cc:9:12: note:   deduced conflicting types for parameter '_RAIter' ('int*' and 'int')
  sort(a,0,2);
            ^