foo.cc: In function 'int main()':
foo.cc:17:8: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<cnt<<endl;
        ^~~
foo.cc:11:3: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(x>max)
   ^~

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