foo.cc: In function 'bool fjudge(long long int)':
foo.cc:37:6: warning: array subscript is above array bounds [-Warray-bounds]
   a[i]=(num/p)%10;
   ~~~^
foo.cc:42:9: warning: array subscript is above array bounds [-Warray-bounds]
   if(a[i]!=a[len-i+1])
      ~~~^
foo.cc:42:21: warning: array subscript is above array bounds [-Warray-bounds]
   if(a[i]!=a[len-i+1])
            ~~~~~~~~~^
foo.cc:42:9: warning: array subscript is above array bounds [-Warray-bounds]
   if(a[i]!=a[len-i+1])
      ~~~^

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

{"receive":"2020-07-05T07:22:38.400Z","handle":"2020-07-05T07:22:38.400Z","cache_start":"2020-07-05T07:22:38.406Z","read_cases":"2020-07-05T07:22:38.525Z","judge":"2020-07-05T07:22:38.526Z","done":"2020-07-05T07:22:43.048Z"}