foo.c: In function 'main':
foo.c:9:8: warning: too many arguments for format [-Wformat-extra-args]
  scanf("&d",&n);
        ^~~~
foo.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("&d",&n);
  ^~~~~~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。