Compile Error.

/tmp/voj-1757/uBrLmCxkyRJq.cpp: In function 'int main()':

/tmp/voj-1757/uBrLmCxkyRJq.cpp:4:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?

4 |     cin >> a >> b;

  |     ^~~

  |     std::cin

In file included from /tmp/voj-1757/uBrLmCxkyRJq.cpp:1:

/usr/include/c++/11/iostream:60:18: note: 'std::cin' declared here

60 | extern istream cin; /// Linked to standard input

  |                  ^~~

/tmp/voj-1757/uBrLmCxkyRJq.cpp:5:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?

5 |     cout << a + b;

  |     ^~~~

  |     std::cout

In file included from /tmp/voj-1757/uBrLmCxkyRJq.cpp:1:

/usr/include/c++/11/iostream:61:18: note: 'std::cout' declared here

61 | extern ostream cout; /// Linked to standard output

  |                  ^~~~

Compile Error, Time = 0 ms, Memory = 0 KB, Score = 0.