Se numeşte permutare a unei mulţimi finite orice rearanjare a tuturor elementelor acelei mulţimi. Cerinţa
Se dă un şir cu n elemente, numere naturale. Să se verifice dacă reprezintă o permutare a mulţimii {1,2,...,n}.

Date de intrare
Programul citește de la tastatură numărul n, iar apoi cele n elemente ale şirului, separate prin spaţii.

Date de ieşire
Programul afișează pe ecran mesajul DA, dacă şirul reprezintă o permutare a mulţimii {1,2,...,n}, respectiv NU în caz contrar.

Restricţii şi precizări
1 ≤ n ≤ 100
Exemplul 1:
Date de intrare

5
2 5 4 3 1
Date de ieșire

DA
Exemplul 2:
Date de intrare

5
2 5 4 3 9
Date de ieșire

NU
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