Problem	helloworld
User	Cat
Submission Time	2025-01-20 16:39:52
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

helloworld.cpp:2:7: error: expected nested-name-specifier before ‘mainspace’
2 | using mainspace std;
| ^~~~~~~~~
helloworld.cpp: In function ‘int main()’:
helloworld.cpp:4:1: error: ‘cout’ was not declared in this scope; did you mean ‘std::cout’?
4 | cout<<"Hello World";
| ^~~~
| std::cout
In file included from helloworld.cpp:1:
/usr/include/c++/9/iostream:61:18: note: ‘std::cout’ declared here
61 | extern ostream cout; /// Linked to standard output
| ^~~~