foo.cc: In function 'int main()':
foo.cc:13:24: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'double*' [-Wformat=]
    scanf("%d", &a[i][j]);
                ~~~~~~~~^
foo.cc:13:9: 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 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)

{"receive":"2020-07-22T01:28:32.624Z","handle":"2020-07-22T01:28:32.624Z","cache_start":"2020-07-22T01:28:32.632Z","read_cases":"2020-07-22T01:28:32.807Z","judge":"2020-07-22T01:28:32.810Z","done":"2020-07-22T01:28:33.390Z"}