Language: C++

#include <bits/stdc++.h>

	int main() {
		int N;
		cin >> N;
		vector < int>t;
		int suma = 0;
		for (int i = 0; i < N; i++) {
			int a;
			cin >> a;
			suma += a;
			if (a % 10 != 0) {
				t.push_back(a);
			}
		}
		int minElement = *std::min_element(t.begin(), t.end());

		
		if (suma % 10 == 0 && !t.empty()) {
			suma -= minElement;
			cout << suma << endl;

		}
		else if (t.empty()) {
			cout << 0 << endl;
		}
		else cout << suma << endl;
		
		return 0;
	}	


Compiler output:
a.cc: In function 'int main()':
a.cc:5:17: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |                 cin >> N;
      |                 ^~~
      |                 std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:17: error: 'vector' was not declared in this scope
    6 |                 vector < int>t;
      |                 ^~~~~~
a.cc:6:17: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:6:26: error: expected primary-expression before 'int'
    6 |                 vector < int>t;
      |                          ^~~
a.cc:13:33: error: 't' was not declared in this scope
   13 |                                 t.push_back(a);
      |                                 ^
a.cc:16:52: error: 't' was not declared in this scope
   16 |                 int minElement = *std::min_element(t.begin(), t.end());
      |                                                    ^
a.cc:21:25: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   21 |                         cout << suma << endl;
      |                         ^~~~
      |                         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:21:41: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   21 |                         cout << suma << endl;
      |                                         ^~~~
      |                                         std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:25:25: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   25 |                         cout << 0 << endl;
      |                         ^~~~
      |                         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:25:38: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   25 |                         cout << 0 << endl;
      |                                      ^~~~
      |                                      std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:27:22: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   27 |                 else cout << suma << endl;
      |                      ^~~~
      |                      std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:27:38: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   27 |                 else cout << suma << endl;
      |                                      ^~~~
      |                                      std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~