/in/foo.cc: In function 'int main()':
/in/foo.cc:14:27: warning: unused variable 'x' [-Wunused-variable]
  int a[10000],b[10000],na,x,nb;
                           ^
/in/foo.cc: In function 'int maxfs(int*, int)':
/in/foo.cc:10:9: warning: 'ansi' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return ansi;  
         ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:21: warning: 'ansi' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<maxfs(a,na)<<" "<<maxfs(b,nb)<<endl; 
                     ^~~
/in/foo.cc:20:36: warning: 'ansi' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<maxfs(a,na)<<" "<<maxfs(b,nb)<<endl; 
                                    ^