foo.cc: In function 'int main()':
foo.cc:41:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
foo.cc:48:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &a[i][j]);
                                  ^

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

{"receive":"2020-03-28T05:50:09.933Z","handle":"2020-03-28T05:50:09.933Z","cache_start":"2020-03-28T05:50:09.940Z","read_cases":"2020-03-28T05:50:10.473Z","judge":"2020-03-28T05:50:10.473Z","done":"2020-03-28T05:50:10.911Z"}