foo.cc: In function 'int main()':
foo.cc:64:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d%s%s%s", &n, a, b, c);
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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":"2020-07-12T07:31:51.569Z","handle":"2020-07-12T07:31:51.569Z","cache_start":"2020-07-12T07:31:51.574Z","read_cases":"2020-07-12T07:31:52.020Z","judge":"2020-07-12T07:31:52.020Z","done":"2020-07-12T07:31:52.326Z"}