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  1. let f n =
  2. for i = 1 to n do
  3. for j = 1 to n do
  4. print_string [|"■"; "□"|].((i + j) mod 2)
  5. done;
  6. done
  7. let () = List.iter f [-1; 1; 2; 3; 10]
Success #stdin #stdout 0s 5320KB
stdin
Standard input is empty
stdout
■
■□
□■
■□■
□■□
■□■
■□■□■□■□■□
□■□■□■□■□■
■□■□■□■□■□
□■□■□■□■□■
■□■□■□■□■□
□■□■□■□■□■
■□■□■□■□■□
□■□■□■□■□■
■□■□■□■□■□
□■□■□■□■□■