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ultima problemă
grupă: mică
sursă: OMI 2016
ultimul articol
autor: Prof. Radu Vişinescu
ultimul software
autor: Prof. Emanuela Cerchez
.campion
vecini


Timp maxim de executie/test:
0.1 secunde
Memorie totala disponibila/stiva:
16 MB/1 MB

Sa se determine cate siruri de lungime n cu elemente din multimea {0, 1, 2} au proprietatea ca diferenta dintre oricare doua elemente vecine in sir este cel mult egala cu 1.

Date de intrare

Fisierul de intrare vecini.in contine pe prima numarul natural n.

Date de iesire

Fisierul de iesire vecini.out va contine o singura linie pe care va fi scris un numar natural reprezentand solutia problemei.

Restrictii si precizari

  • 0 < n <= 2000
  • Solutia va avea cel mult 1000 cifre.
Exemplu
vecini.in vecini.out Explicatie

3

17

Cele 17 solutii sunt:
000
001
010
011
012
100
101
110
111
112
121
122
210
211
212
221
222

prof. Emanuela Cerchez
Liceul de Informatica "Grigore Moisil" Iasi
Contact:emanuela.cerchez@gmail.com

propunător: Prof. Emanuela Cerchez
emanuela.cerchez@gmail.com
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