let ll1 = string_of_int (List.length l1) in
let ll2 = string_of_int (List.length l2) in
let diff = string_of_float (after -. before) in
- prerr_endline
+ print_endline
("INTERSECT(" ^ ll1 ^ "," ^ ll2 ^ ") = " ^ string_of_int (List.length res) ^
": " ^ diff ^ "s") ;
- flush stderr ;
+ flush stdout ;
res
;;