Feu un programa que escrigui
totes les combinacions de n − u zeros i u uns,
per a un n i un u donats.
Entrada
L’entrada consisteix en n i u,
dos naturals tals que n > 0 i 0 ≤ u ≤ n.
Sortida
Escriviu totes les combinacions de n − u zeros i u uns,
una per línia i en ordre lexicogràfic.
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