foo.cc:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated]
    1 | #import<iostream>
      |  ^~~~~~
foo.cc:2:1: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type]
    2 | main(){int a,b;std::cin>>a>>b;std::cout<<a+b;}
      | ^~~~