foo.cc: In function 'int main()':
foo.cc:6:2: error: 'cin' was not declared in this scope
cin >> a >> b ;
^~~
foo.cc:6:2: note: suggested alternative:
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:75:0,
from foo.cc:1:
/usr/include/c++/7/iostream:60:18: note: 'std::cin'
extern istream cin; /// Linked to standard input
^~~
foo.cc:7:2: error: 'cout' was not declared in this scope
cout << a + b << endl ;
^~~~
foo.cc:7:2: note: suggested alternative:
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:75:0,
from foo.cc:1:
/usr/include/c++/7/iostream:61:18: note: 'std::cout'
extern ostream cout; /// Linked to standard output
^~~~
foo.cc:7:19: error: 'endl' was not declared in this scope
cout << a + b << endl ;
^~~~
foo.cc:7:19: note: suggested alternative:
In file included from /usr/include/c++/7/istream:39:0,
from /usr/include/c++/7/sstream:38,
from /usr/include/c++/7/complex:45,
from /usr/include/c++/7/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:52,
from foo.cc:1:
/usr/include/c++/7/ostream:590:5: note: 'std::endl'
endl(basic_ostream<_CharT, _Traits>& __os)
^~~~
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。