/in/foo.cc: In function 'int als(int)':
/in/foo.cc:4:6: warning: unused variable 'n' [-Wunused-variable]
    4 |  int n=a;
      |      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:21:7: warning: iteration 9999 invokes undefined behavior [-Waggressive-loop-optimizations]
   21 |   n[i]=als(i);
      |   ~~~~^~~~~~~
/in/foo.cc:20:15: note: within this loop
   20 |  for(int i=1;i<=10000;i++){
      |              ~^~~~~~~