- myfill($_[0], 0, $a, $x);
- myfill($_[0], $a, $b, 1 - $x);
- myfill($_[0], $a + $b, $n - ($a + $b), $x) if $a + $b < $n;
+ myfill $_[0], 0, $a, $x;
+ myfill $_[0], $a, $b, 1 - $x;
+ myfill $_[0], $a + $b, $n - ($a + $b), $x if $a + $b < $n;
+ } else {
+ rst $_[0];