foo.cc: In function 'int main()':
foo.cc:8:48: warning: unused variable 'e' [-Wunused-variable]
  int n,m,k,a[10001],b[10001],c[10001],d[10001],e[10001],i,j;
                                                ^
foo.cc:20:11: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   a[i]=b[j];
        ~~~^

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