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== Rezolvare == <syntaxhighlight lang="python" line> from collections import Counter def count_domains(emails): # Funcția numără câte adrese de email sunt asociate cu fiecare nume de domeniu. # Extragem numele de domeniu din fiecare adresă de email și le numărăm domains = [email.split('@')[1] for email in emails] return Counter(domains) def main(): with open('emailin.txt', 'r') as fin, open('emailout.txt', 'w') as fout: emails = [line.strip() for line in fin] # Verificăm dacă adresele de email respectă restricțiile if len(emails) > 1000 or any(len(email) > 50 for email in emails): fout.write("Datele de intrare nu corespund restrictiilor impuse\n") return fout.write("Datele de intrare corespund restrictiilor impuse\n") # Numărăm câte adrese de email sunt asociate cu fiecare nume de domeniu domain_counts = count_domains(emails) # Sortăm numele de domeniu în ordine descrescătoare a numărului de adrese asociate sorted_domains = sorted(domain_counts.items(), key=lambda x: (-x[1], x[0])) # Scriem numărul de nume de domenii diferite și numărul de adrese asociate cu fiecare domeniu fout.write(str(len(sorted_domains)) + '\n') for domain, count in sorted_domains: fout.write(f'{domain} {count}\n') if __name__ == "__main__": main() </syntaxhighlight>
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