运行 ID: 349746

Main.cc:2:7: error: expected nested-name-specifier before ‘nemsapcestd’
 using nemsapcestd std;
       ^~~~~~~~~~~
Main.cc: In function ‘int main()’:
Main.cc:4:2: error: ‘cout’ was not declared in this scope
  cout<<"煞笔";
  ^~~~
Main.cc:4:2: 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:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~