foo.cc: In function 'int main()':
foo.cc:5:32: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int n,s,a[10000],x=1,y=n,mid=x+y>>1;
                               ~^~
foo.cc:5:23: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  int n,s,a[10000],x=1,y=n,mid=x+y>>1;
                       ^

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

{"receive":"2020-07-10T07:27:15.938Z","handle":"2020-07-10T07:27:15.938Z","cache_start":"2020-07-10T07:27:15.947Z","read_cases":"2020-07-10T07:27:16.079Z","judge":"2020-07-10T07:27:16.080Z","done":"2020-07-10T07:27:17.532Z"}