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3054 - PrimeXXL
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== Cerinţa == Se dă un număr natural '''n'''. Să se afișeze '''DA''' dacă numărul este prim altfel se afișează '''NU'''. == Date de intrare == Fișierul de intrare '''primexxlin.txt''' conține pe prima linie numărul '''n'''. == Date de ieșire == Fișierul de ieșire '''primexxlout.txt''' va conține pe prima linie '''DA''' sau '''NU''' după caz. == Restricţii şi precizări == * '''1 ≤ nrcif(n) ≤ 1000''' == Exemplu 1 == ; primexxlin.txt 5 ; primexxlout.txt Datele de intrare corespund restrictiilor impuse DA <br> == Exemplu 2 == ; primexxlin.txt 10000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001000000000100000000010000000001 ; primexxlout.txt Datele de intrare nu corespund restrictiilor impuse <br> == Rezolvare == <syntaxhighlight lang="python" line> def is_prime(n): # Funcția verifică dacă un număr este prim. if n < 2: return False if n == 2: return True if n % 2 == 0: return False p = 3 while p * p <= n: if n % p == 0: return False p += 2 return True def main(): with open('primexxlin.txt', 'r') as fin, open('primexxlout.txt', 'w') as fout: n = int(fin.readline().strip()) # Verificăm dacă numărul respectă restricțiile if len(str(n)) > 1000: fout.write("Datele de intrare nu corespund restrictiilor impuse\n") return fout.write("Datele de intrare corespund restrictiilor impuse\n") # Verificăm dacă numărul este prim și scriem rezultatul în fișierul de ieșire fout.write('DA\n' if is_prime(n) else 'NU\n') if __name__ == "__main__": main() </syntaxhighlight>
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