foo.c: In function 'main':
foo.c:6:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",num);
  ^~~~~~~~~~~~~~~

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":"2020-07-21T15:51:41.367Z","handle":"2020-07-21T15:51:41.368Z","cache_start":"2020-07-21T15:51:41.374Z","read_cases":"2020-07-21T15:51:41.809Z","judge":"2020-07-21T15:51:41.809Z","done":"2020-07-21T15:51:41.894Z"}