foo.cc: In function 'int main()':
foo.cc:22:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
                 scanf("%d",&ma[i][j]);
                 ~~~~~^~~~~~~~~~~~~~~~

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

{"receive":"2020-07-30T14:03:01.494Z","handle":"2020-07-30T14:03:01.494Z","cache_start":"2020-07-30T14:03:01.502Z","read_cases":"2020-07-30T14:03:01.614Z","judge":"2020-07-30T14:03:01.615Z","done":"2020-07-30T14:03:02.153Z"}