foo.cc: In function 'int main(int, const char**)':
foo.cc:81:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
                          ^
foo.cc:84:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &a[i][j]);
                                  ^
foo.cc:87:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &k);
                    ^
foo.cc:90:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
                              ^

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

{"receive":"2020-05-11T12:45:45.795Z","handle":"2020-05-11T12:45:45.795Z","cache_start":"2020-05-11T12:45:45.805Z","read_cases":"2020-05-11T12:45:45.934Z","judge":"2020-05-11T12:45:45.936Z","done":"2020-05-11T12:45:49.721Z"}