foo.cc: In function 'int main()':
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&mn);
  ~~~~~^~~~~~~~~~
foo.cc:9:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%lf",&a[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~

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

正在同步测试数据，请稍后
{"receive":"2020-07-23T14:39:05.529Z","handle":"2020-07-23T14:39:05.529Z","cache_start":"2020-07-23T14:39:05.535Z","read_cases":"2020-07-23T14:39:06.122Z","judge":"2020-07-23T14:39:06.123Z","done":"2020-07-23T14:39:07.293Z"}