foo.cc: In function 'int main()':
foo.cc:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
foo.cc:17:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&dist[i][j]);
             ~~~~~^~~~~~~~~~~~~~~~~~

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

{"receive":"2020-07-30T14:04:30.669Z","handle":"2020-07-30T14:04:30.669Z","cache_start":"2020-07-30T14:04:30.677Z","read_cases":"2020-07-30T14:04:31.007Z","judge":"2020-07-30T14:04:31.007Z","done":"2020-07-30T14:04:31.512Z"}