foo.cc: In function 'int main()':
foo.cc:34:3: warning: 'index' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for (int j = index; j <= n; j++)
   ^

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

{"receive":"2020-04-27T02:31:57.468Z","handle":"2020-04-27T02:31:57.468Z","cache_start":"2020-04-27T02:31:57.475Z","read_cases":"2020-04-27T02:31:58.409Z","judge":"2020-04-27T02:31:58.409Z","done":"2020-04-27T02:32:01.141Z"}