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Se defineste 12-permutarea $A{~1~},A{~2~},...,A{~N~}$ ca fiind o permutare a numerelor $1,2,...,N$ astfel incat $|A{~i~} - A{~i+1~}|$ pentru $i=1,2,...,N-1$.

Se defineste 12-permutarea $A{~1~},A{~2~},...,A{~N~}$ ca fiind o permutare a numerelor $1,2,...,N$ astfel incat $|A{~i~} - A{~i+1~}|<3$ pentru $i=1,2,...,N-1$.

h2. Cerinta

h2. Explicatii

h3. Explicatii

Cele $12$ 12-permutari sunt: $1 2 3 4, 1 2 4 3, 1 3 2 4, 1 3 4 2, 2 1 3 4, 2 4 3 1, 3 1 2 4, 3 4 2 1, 4 2 1 3, 4 2 3 1, 4 3 1 2, 4 3 2 1$
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