foo.cc: In function 'int main()':
foo.cc:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:41:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%c", &op);
         ~~~~~^~~~~~~~~~~
foo.cc:45:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &u);
             ~~~~~^~~~~~~~~~
foo.cc:57:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d %d", &m, &p);
             ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:64:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d %d", &m, &p);
             ~~~~~^~~~~~~~~~~~~~~~~

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

{"receive":"2020-07-24T18:04:00.074Z","handle":"2020-07-24T18:04:00.074Z","cache_start":"2020-07-24T18:04:00.081Z","read_cases":"2020-07-24T18:04:00.213Z","judge":"2020-07-24T18:04:00.214Z","done":"2020-07-24T18:04:02.037Z"}