foo.cc: In function 'int main()':
foo.cc:13:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^
foo.cc:15:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d",&k,&l,&r);
                           ^

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

{"receive":"2020-03-31T01:25:49.091Z","handle":"2020-03-31T01:25:49.091Z","cache_start":"2020-03-31T01:25:49.099Z","read_cases":"2020-03-31T01:25:49.241Z","judge":"2020-03-31T01:25:49.245Z","done":"2020-03-31T01:25:49.489Z"}