Language: C++

#include "bits/stdc++.h"
using namespace std;

int main() {
    long long cnt = 0;
    bool flag = false;
    long long MIN = pow(10, 9);
    int N;
    cin >> N;
    vector<int> A(N);
    for (int i = 0; i < N; i++) {
        cin >> A[i];
        if (A[i] < 0) {
            cnt++;
            MIN = min(MIN, abs(A[i]));
        }
        else if (A[i] > 0) {
            MIN = min(MIN, A[i]);
        }
        else if (A[i] == 0) flag = true;
    }

    long long sum = 0;
    for (int i = 0; i < N; i++) sum += abs(A[i]);
    if (cnt % 2 == 0) cout << sum << endl;
    else {
        if (flag) cout << sum << endl;
        else cout << sum - MIN << endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:22: error: no matching function for call to 'min(long long int&, int)'
   15 |             MIN = min(MIN, abs(A[i]));
      |                   ~~~^~~~~~~~~~~~~~~~
In file included 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/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:15:22: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   15 |             MIN = min(MIN, abs(A[i]));
      |                   ~~~^~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:15:22: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   15 |             MIN = min(MIN, abs(A[i]));
      |                   ~~~^~~~~~~~~~~~~~~~
a.cc:18:22: error: no matching function for call to 'min(long long int&, __gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type&)'
   18 |             MIN = min(MIN, A[i]);
      |                   ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:18:22: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'})
   18 |             MIN = min(MIN, A[i]);
      |                   ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:18:22: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   18 |             MIN = min(MIN, A[i]);
      |                   ~~~^~~~~~~~~~~