运行 ID: 71754

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:5:5: error: ‘cin’ was not declared in this scope
     cin>>n;
     ^~~
Main.cc:5:5: note: suggested alternative:
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:75:0,
                 from Main.cc:1:
/usr/include/c++/7/iostream:60:18: note:   ‘std::cin’
   extern istream cin;  /// Linked to standard input
                  ^~~
Main.cc:16:5: error: ‘cout’ was not declared in this scope
     cout<