foo.cc: In function 'void init()':
foo.cc:30:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^
foo.cc:38:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     {scanf("%s",ch);
                    ^

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

{"receive":"2020-03-28T07:19:37.848Z","handle":"2020-03-28T07:19:37.848Z","cache_start":"2020-03-28T07:19:37.855Z","read_cases":"2020-03-28T07:19:38.015Z","judge":"2020-03-28T07:19:38.016Z","done":"2020-03-28T07:19:38.827Z"}