foo.cc: In function 'int getin(int*, int)':
foo.cc:24:6: warning: unused variable 'm' [-Wunused-variable]
  int m;
      ^
foo.cc: In function 'int main()':
foo.cc:13:3: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  n=getin(a,n);
  ~^~~~~~~~~~~

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