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Lỗi biên dịch:

Main.cc: In function ‘int Count(int, char)’:
Main.cc:9:5: error: ‘string’ was not declared in this scope
    9 |     string s = to_string(n);
      |     ^~~~~~
Main.cc:5:1: note: ‘std::string’ is defined in header ‘’; did you forget to ‘#include ’?
    4 | #include 
  +++ |+#include 
    5 | using namespace std;
Main.cc:10:18: error: ‘s’ was not declared in this scope
   10 |     return count(s.begin(), s.end(), k);
      |                  ^
Main.cc:10:12: error: ‘count’ was not declared in this scope; did you mean ‘Count’?
   10 |     return count(s.begin(), s.end(), k);
      |            ^~~~~
      |            Count
Main.cc: In function ‘int main()’:
Main.cc:16:5: error: ‘cin’ was not declared in this scope
   16 |     cin >> t;
      |     ^~~
Main.cc:5:1: note: ‘std::cin’ is defined in header ‘’; did you forget to ‘#include ’?
    4 | #include 
  +++ |+#include 
    5 | using namespace std;
Main.cc:27:9: error: ‘cout’ was not declared in this scope
   27 |         cout << res << '\n';
      |         ^~~~
Main.cc:27:9: note: ‘std::cout’ is defined in header ‘’; did you forget to ‘#include ’?