foo.cc: In function 'int main()':
foo.cc:5:11: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  int n,a[n],cnt=0,max=-9999;
           ^

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