/in/foo.cc:2:1: error: 'cin' does not name a type
    2 | cin>>y;
      | ^~~
/in/foo.cc:3:1: error: expected unqualified-id before 'if'
    3 | if(y%4==0&&y%100!=0||y%400==0)
      | ^~
/in/foo.cc:5:1: error: expected unqualified-id before 'else'
    5 | else
      | ^~~~
/in/foo.cc:7:1: error: expected unqualified-id before 'return'
    7 | return 0;
      | ^~~~~~