Dibuixeu papallones seguint el format dels exemples.
Entrada
L’entrada és un natural n ≥ 2.
Sortida
Cal que dibuixeu una papallona de llargada 2n−1 i amplada 2n+3 seguint el
format dels exemples.
About statements
The official statement of a problem is always the one
in the PDF document. The HTML version of the statement
is also given to help you, but may contain some content
that is not well displayed. In case of doubt, always use the PDF.