foo.cc: In function 'int main(int, const char**)':
foo.cc:165:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
                          ^
foo.cc:168:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &o);
                        ^
foo.cc:170:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d%d%d", &l, &r, &x);
                                        ^
foo.cc:175:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d%d", &l, &r);
                                  ^

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

{"receive":"2020-05-11T08:36:48.331Z","handle":"2020-05-11T08:36:48.331Z","cache_start":"2020-05-11T08:36:48.338Z","read_cases":"2020-05-11T08:36:48.464Z","judge":"2020-05-11T08:36:48.464Z","done":"2020-05-11T08:36:50.464Z"}