foo.cc:9:17: error: 'DT' does not name a type
 bool cmp (const DT&l,const DT&r ){
                 ^~
foo.cc:9:28: error: 'DT' does not name a type
 bool cmp (const DT&l,const DT&r ){
                            ^~
foo.cc: In function 'bool cmp(const int&, const int&)':
foo.cc:10:14: error: request for member 'x' in 'l', which is of non-class type 'const int'
     return l.x < r.x ;
              ^
foo.cc:10:20: error: request for member 'x' in 'r', which is of non-class type 'const int'
     return l.x < r.x ;
                    ^
foo.cc: In function 'int main()':
foo.cc:20:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=1;i<=n;i++)
     ^~~
foo.cc:24:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  printf("%d",Gun);
  ^~~~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = Node*; _Iterator2 = Node*; _Compare = bool (*)(const int&, const int&)]':
/usr/include/c++/7/bits/stl_algo.h:1847:14:   required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1885:25:   required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1971:31:   required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:4868:18:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = Node*; _Compare = bool (*)(const int&, const int&)]'
foo.cc:18:23:   required from here
/usr/include/c++/7/bits/predefined_ops.h:143:18: error: invalid initialization of reference of type 'const int&' from expression of type 'Node'
         { return bool(_M_comp(*__it1, *__it2)); }
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/7/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Val_comp_iter<_Compare>::operator()(_Value&, _Iterator) [with _Value = Node; _Iterator = Node*; _Compare = bool (*)(const int&, const int&)]':
/usr/include/c++/7/bits/stl_algo.h:1828:20:   required from 'void std::__unguarded_linear_insert(_RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Val_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1855:36:   required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1885:25:   required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1971:31:   required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:4868:18:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = Node*; _Compare = bool (*)(const int&, const int&)]'
foo.cc:18:23:   required from here
/usr/include/c++/7/bits/predefined_ops.h:215:11: error: invalid initialization of reference of type 'const int&' from expression of type 'Node'
  { return bool(_M_comp(__val, *__it)); }
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/7/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = Node*; _Value = Node; _Compare = bool (*)(const int&, const int&)]':
/usr/include/c++/7/bits/stl_heap.h:133:48:   required from 'void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare&) [with _RandomAccessIterator = Node*; _Distance = long int; _Tp = Node; _Compare = __gnu_cxx::__ops::_Iter_comp_val<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_heap.h:237:23:   required from 'void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = Node*; _Distance = long int; _Tp = Node; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_heap.h:342:22:   required from 'void std::__make_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare&) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1672:23:   required from 'void std::__heap_select(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1933:25:   required from 'void std::__partial_sort(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1948:27:   required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = Node*; _Size = long int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:1968:25:   required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Node*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(const int&, const int&)>]'
/usr/include/c++/7/bits/stl_algo.h:4868:18:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = Node*; _Compare = bool (*)(const int&, const int&)]'
foo.cc:18:23:   required from here
/usr/include/c++/7/bits/predefined_ops.h:177:11: error: invalid initialization of reference of type 'const int&' from expression of type 'Node'
  { return bool(_M_comp(*__it, __val)); }
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&x,&x,&n);
     ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:17:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&a[i].x,&a[i].y);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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