foo.cc: In function 'int main()':
foo.cc:50:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^
foo.cc:53:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   eve[st][++tp[st]]=pii(tim,len);
                                 ^
foo.cc:53:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
foo.cc:81:13: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
  prtime(pos);
             ^

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

{"receive":"2020-04-02T13:52:27.820Z","handle":"2020-04-02T13:52:27.820Z","cache_start":"2020-04-02T13:52:27.827Z","read_cases":"2020-04-02T13:52:28.008Z","judge":"2020-04-02T13:52:28.010Z","done":"2020-04-02T13:52:29.073Z"}