foo.cc: In function 'int main()':
foo.cc:40:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("Trees.in" , "r" , stdin);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:41:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("Trees.out" , "w" , stdout);
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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":"2020-07-30T09:22:49.375Z","handle":"2020-07-30T09:22:49.376Z","cache_start":"2020-07-30T09:22:49.404Z","read_cases":"2020-07-30T09:22:50.001Z","judge":"2020-07-30T09:22:50.002Z","done":"2020-07-30T09:22:51.724Z"}