View Compilation Error

0_0_39484353_12623.cpp:3:5: error: cannot declare '::main' to be a global variable
    3 | int main(
      |     ^~~~
0_0_39484353_12623.cpp:4:20: error: expected ')' before ';' token
    4 |   cout<<"4\n-1\n13";
      |                    ^
      |                    )
0_0_39484353_12623.cpp:3:9: note: to match this '('
    3 | int main(
      |         ^
0_0_39484353_12623.cpp:5:3: error: expected unqualified-id before 'return'
    5 |   return 0;
      |   ^~~~~~
0_0_39484353_12623.cpp:6:1: error: expected declaration before '}' token
    6 | }
      | ^