Language: C++

#include <iostream> 
#include <vector>
using namespace std;

int main() {
  int N;

  cin >> N;
  vector<string> vec(N);
  for (int i = 0; i < N; i++) {
    cin >> vec.at(i);
  }

  int AC = 0;
  int WA = 0;
  int TLE = 0;
  int RE = 0;
  for (int i = 0; i < N; i++) {
    if (vec.at(i) = "AC") {
      AC = AC + 1;
    }
    else if (vec.at(i) = "WA") {
      WA = WA + 1;
    }
    else if (vec.at(i) = "TLE") {
      TLE = TLE + 1;
    }
    else {
      RE = RE + 1;
    }
  }

  cout << "AC　×　"　<< AC << endl;
  cout << "WA　×　"　<< WA << endl;
  cout << "TLE　×　"　<< TLE << endl;
  cout << "RE　×　"　<< RE << endl;
}

Compiler output:
a.cc:33:11: error: extended character 　 is not valid in an identifier
   33 |   cout << "AC　×　"　<< AC << endl;
      |           ^
a.cc:34:11: error: extended character 　 is not valid in an identifier
   34 |   cout << "WA　×　"　<< WA << endl;
      |           ^
a.cc:35:11: error: extended character 　 is not valid in an identifier
   35 |   cout << "TLE　×　"　<< TLE << endl;
      |           ^
a.cc:36:11: error: extended character 　 is not valid in an identifier
   36 |   cout << "RE　×　"　<< RE << endl;
      |           ^
a.cc: In function 'int main()':
a.cc:19:19: error: could not convert '(& vec.std::vector<std::__cxx11::basic_string<char> >::at(((std::vector<std::__cxx11::basic_string<char> >::size_type)i)))->std::__cxx11::basic_string<char>::operator=(((const char*)"AC"))' from 'std::__cxx11::basic_string<char>' to 'bool'
   19 |     if (vec.at(i) = "AC") {
      |         ~~~~~~~~~~^~~~~~
      |                   |
      |                   std::__cxx11::basic_string<char>
a.cc:22:24: error: could not convert '(& vec.std::vector<std::__cxx11::basic_string<char> >::at(((std::vector<std::__cxx11::basic_string<char> >::size_type)i)))->std::__cxx11::basic_string<char>::operator=(((const char*)"WA"))' from 'std::__cxx11::basic_string<char>' to 'bool'
   22 |     else if (vec.at(i) = "WA") {
      |              ~~~~~~~~~~^~~~~~
      |                        |
      |                        std::__cxx11::basic_string<char>
a.cc:25:24: error: could not convert '(& vec.std::vector<std::__cxx11::basic_string<char> >::at(((std::vector<std::__cxx11::basic_string<char> >::size_type)i)))->std::__cxx11::basic_string<char>::operator=(((const char*)"TLE"))' from 'std::__cxx11::basic_string<char>' to 'bool'
   25 |     else if (vec.at(i) = "TLE") {
      |              ~~~~~~~~~~^~~~~~~
      |                        |
      |                        std::__cxx11::basic_string<char>
a.cc:33:11: error: unable to find string literal operator 'operator""\U00003000' with 'const char [11]', 'long unsigned int' arguments
   33 |   cout << "AC　×　"　<< AC << endl;
      |           ^~~~~~~~~~~
a.cc:34:11: error: unable to find string literal operator 'operator""\U00003000' with 'const char [11]', 'long unsigned int' arguments
   34 |   cout << "WA　×　"　<< WA << endl;
      |           ^~~~~~~~~~~
a.cc:35:11: error: unable to find string literal operator 'operator""\U00003000' with 'const char [12]', 'long unsigned int' arguments
   35 |   cout << "TLE　×　"　<< TLE << endl;
      |           ^~~~~~~~~~~~
a.cc:36:11: error: unable to find string literal operator 'operator""\U00003000' with 'const char [11]', 'long unsigned int' arguments
   36 |   cout << "RE　×　"　<< RE << endl;
      |           ^~~~~~~~~~~