foo.cc: In function 'int Merge(int*, int, int*, int)':
foo.cc:34:6: warning: variable 'x' set but not used [-Wunused-but-set-variable]
  int x[10000];
      ^
foo.cc: In function 'int main()':
foo.cc:29:8: warning: 'h' is used uninitialized in this function [-Wuninitialized]
  Output(x,h);
  ~~~~~~^~~~~

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