/in/foo.cc: In function 'int main()':
/in/foo.cc:6:9: error: expected initializer before 'cin'
    6 |         cin>>n;
      |         ^~~
/in/foo.cc:9:24: error: 'n' was not declared in this scope
    9 |         for(int i=1;i<=n;i++)
      |                        ^