/in/foo.cc: In function 'int main()':
/in/foo.cc:8:25: error: expected unqualified-id before ';' token
    8 |         for(int i=0;i<n.;i++){
      |                         ^
/in/foo.cc:18:27: error: 'o' was not declared in this scope
   18 |                 for(int j=o;j<n;j++){
      |                           ^
/in/foo.cc:34:32: warning: zero-length gnu_printf format string [-Wformat-zero-length]
   34 |                         printf("");
      |                                ^~