Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <string>
#include <numeric>

using ll = long long;

using namespace std;

long sig[8][3] = {{ 1,  1,  1},
                  { 1,  1, -1},
                  { 1, -1,  1},
                  { 1, -1, -1},
                  {-1,  1,  1},
                  {-1,  1, -1},
                  {-1, -1,  1},
                  {-1, -1, -1}};

int main() {
    int n, m;
    cin >> n >> m;
    long val[8][1010] = {{0}};
    for (int i=0; i<n; i++) {
        for (int j=0; j<3; j++) {
            long xyz; cin >> xyz;
            for (int k=0; k<8; k++) {
                val[k][i] += sig[k][j] * xyz;
            }
        }
    }
    long ans=0;
    for (int i=0; i<8; i++) {
        sort(val[i], val[i+1], greater<int>());
        //ans = max(ans, accumulate(val[i], val[i]+m, 0l));
        int sum=0;
        for (int j=0; j<m; j++) sum += val[i][j];
        ans = max(ans, sum);
    }
    cout << ans << '\n';
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:39:18: error: no matching function for call to 'max(long int&, int&)'
   39 |         ans = max(ans, sum);
      |               ~~~^~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:39:18: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and 'int')
   39 |         ans = max(ans, sum);
      |               ~~~^~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:39:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   39 |         ans = max(ans, sum);
      |               ~~~^~~~~~~~~~