foo.cc: In function 'int fj(int*, int)':
foo.cc:23:6: warning: unused variable 'cnt' [-Wunused-variable]
  int cnt=0;
      ^~~
foo.cc:30:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
foo.cc: In function 'int findmax(int*)':
foo.cc:43:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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