foo.cc: In function 'int main()':
foo.cc:33:18: warning: unused variable 'tmp' [-Wunused-variable]
     int a, b, c, tmp;
                  ^
foo.cc:36:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &M, &N);
                          ^
foo.cc:39:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d", &a, &b, &c);
                                    ^

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

{"receive":"2020-04-27T14:32:35.257Z","handle":"2020-04-27T14:32:35.258Z","cache_start":"2020-04-27T14:32:35.264Z","read_cases":"2020-04-27T14:32:35.910Z","judge":"2020-04-27T14:32:35.911Z","done":"2020-04-27T14:32:36.439Z"}