foo.cc: In function 'int main()':
foo.cc:55:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
foo.cc:62:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&cache);
    ~~~~~^~~~~~~~~~~~~
foo.cc: In function 'void tarjan(int)':
foo.cc:23:10: warning: 'cnt' is used uninitialized in this function [-Wuninitialized]
  dfn[now]=low[now]=++cnt;  //初始化
  ~~~~~~~~^~~~~~~~~~~~~~~

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

正在同步测试数据，请稍后
{"receive":"2020-08-07T12:37:07.399Z","handle":"2020-08-07T12:37:07.409Z","cache_start":"2020-08-07T12:37:07.558Z","read_cases":"2020-08-07T12:37:08.123Z","judge":"2020-08-07T12:37:08.129Z","done":"2020-08-07T12:37:09.538Z"}