Language: C++

#include <bits/stdc++.h>
#define ll long long
using namespace std;

ll n,m,sumv=0;
ll mon[100005];

void cmp(ll a,ll b)
{
	return a<b;
}

ll minuss(ll a,ll b)
{
	if (a>=b)  return ll(a-b);
	else return 0ll;
}

int main()
{
	cin>>n>>m;
	for (ll i=1;i<=n;i++)  cin>>mon[i];
	sort(mon+1,mon+n+1,cmp);
	for (ll i=1;i<=minuss(n,m);i++)  sumv+=mon[i];
	cout<<sumv<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'void cmp(long long int, long long int)':
a.cc:10:17: error: return-statement with a value, in function returning 'void' [-fpermissive]
   10 |         return a<b;
      |                ~^~
a.cc: In function 'long long int minuss(long long int, long long int)':
a.cc:2:12: error: expected primary-expression before 'long'
    2 | #define ll long long
      |            ^~~~
a.cc:15:27: note: in expansion of macro 'll'
   15 |         if (a>=b)  return ll(a-b);
      |                           ^~
a.cc:15:26: error: expected ';' before 'long'
   15 |         if (a>=b)  return ll(a-b);
      |                          ^
      |                          ;
a.cc:2:12: error: expected primary-expression before 'long'
    2 | #define ll long long
      |            ^~~~
a.cc:15:27: note: in expansion of macro 'll'
   15 |         if (a>=b)  return ll(a-b);
      |                           ^~
a.cc:16:9: error: 'else' without a previous 'if'
   16 |         else return 0ll;
      |         ^~~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:71,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/predefined_ops.h: In instantiation of 'constexpr bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = long long int*; _Iterator2 = long long int*; _Compare = void (*)(long long int, long long int)]':
/usr/include/c++/14/bits/stl_algo.h:1777:14:   required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1777 |           if (__comp(__i, __first))
      |               ~~~~~~^~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1817:25:   required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1817 |           std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
      |           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1908:31:   required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1908 |           std::__final_insertion_sort(__first, __last, __comp);
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:4805:18:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = long long int*; _Compare = void (*)(long long int, long long int)]'
 4805 |       std::__sort(__first, __last, __gnu_cxx::__ops::__iter_comp_iter(__comp));
      |       ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:23:6:   required from here
   23 |         sort(mon+1,mon+n+1,cmp);
      |         ~~~~^~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/predefined_ops.h:158:23: error: void value not ignored as it ought to be
  158 |         { return bool(_M_comp(*__it1, *__it2)); }
      |                       ^~~~~~~
/usr/include/c++/14/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Val_comp_iter<_Compare>::operator()(_Value&, _Iterator) [with _Value = long long int; _Iterator = long long int*; _Compare = void (*)(long long int, long long int)]':
/usr/include/c++/14/bits/stl_algo.h:1757:20:   required from 'void std::__unguarded_linear_insert(_RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Val_comp_iter<void (*)(long long int, long long int)>]'
 1757 |       while (__comp(__val, __next))
      |              ~~~~~~^~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1785:36:   required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1785 |             std::__unguarded_linear_insert(__i,
      |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
 1786 |                                 __gnu_cxx::__ops::__val_comp_iter(__comp));
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1817:25:   required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1817 |           std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
      |           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1908:31:   required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1908 |           std::__final_insertion_sort(__first, __last, __comp);
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:4805:18:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = long long int*; _Compare = void (*)(long long int, long long int)]'
 4805 |       std::__sort(__first, __last, __gnu_cxx::__ops::__iter_comp_iter(__comp));
      |       ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:23:6:   required from here
   23 |         sort(mon+1,mon+n+1,cmp);
      |         ~~~~^~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/predefined_ops.h:240:23: error: void value not ignored as it ought to be
  240 |         { return bool(_M_comp(__val, *__it)); }
      |                       ^~~~~~~
/usr/include/c++/14/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = long long int*; _Value = long long int; _Compare = void (*)(long long int, long long int)]':
/usr/include/c++/14/bits/stl_heap.h:140:48:   required from 'void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare&) [with _RandomAccessIterator = long long int*; _Distance = long int; _Tp = long long int; _Compare = __gnu_cxx::__ops::_Iter_comp_val<void (*)(long long int, long long int)>]'
  140 |       while (__holeIndex > __topIndex && __comp(__first + __parent, __value))
      |                                          ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_heap.h:247:23:   required from 'void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = long long int*; _Distance = long int; _Tp = long long int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
  247 |       std::__push_heap(__first, __holeIndex, __topIndex,
      |       ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  248 |                        _GLIBCXX_MOVE(__value), __cmp);
      |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_heap.h:356:22:   required from 'void std::__make_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare&) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
  356 |           std::__adjust_heap(__first, __parent, __len, _GLIBCXX_MOVE(__value),
      |           ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  357 |                              __comp);
      |                              ~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1593:23:   required from 'void std::__heap_select(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1593 |       std::__make_heap(__first, __middle, __comp);
      |       ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1868:25:   required from 'void std::__partial_sort(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1868 |       std::__heap_select(__first, __middle, __last, __comp);
      |       ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1884:27:   required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = long long int*; _Size = long int; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1884 |               std::__partial_sort(__first, __last, __last, __comp);
      |               ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1905:25:   required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = long long int*; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<void (*)(long long int, long long int)>]'
 1905 |           std::__introsort_loop(__first, __last,
      |           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
 1906 |                                 std::__lg(__last - __first) * 2,
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1907 |                                 __comp);
      |                                 ~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:4805:18:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = long long int*; _Compare = void (*)(long long int, long long int)]'
 4805 |       std::__sort(__first, __last, __gnu_cxx::__ops::__iter_comp_iter(__comp));
      |       ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~