运行 ID: 42199

Main.cc:2:17: error: ‘tsd’ is not a namespace-name
 using namespace tsd;
                 ^~~
Main.cc:2:20: error: expected namespace-name before ‘;’ token
 using namespace tsd;
                    ^
Main.cc: In function ‘int main()’:
Main.cc:6:2: error: ‘cin’ was not declared in this scope
  cin>>n>>m;
  ^~~
Main.cc:6:2: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:60:18: note:   ‘std::cin’
   extern istream cin;  /// Linked to standard input
                  ^~~
Main.cc:18:6: error: ‘k’ was not declared in this scope
      k--;
      ^
Main.cc:20:7: error: ‘cout’ was not declared in this scope
       cout<& __os)
     ^~~~