foo.cc: In function 'int maxgeshu(int)':
foo.cc:13:6: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int max,cnt=0,b[100000];
      ^~~

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