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== Rezolvare == <syntaxhighlight lang="python" line> def main(): # Citirea șirului de caractere de la tastatură sir = input().strip() # Verifică dacă șirul respectă restricțiile if len(sir) > 255: print("Datele de intrare nu corespund restrictiilor impuse") return if any(not caracter.islower() for caracter in sir): print("Datele de intrare nu corespund restrictiilor impuse") return print("Datele de intrare corespund restrictiilor impuse") # Căutarea celui mai lung subșir care apare de cel puțin două ori lungime_maxima = 0 subșir_maxim = '' for i in range(len(sir)): for j in range(i+2, len(sir)+1): subșir = sir[i:j] if sir.count(subșir) >= 2 and len(subșir) > lungime_maxima: lungime_maxima = len(subșir) subșir_maxim = subșir elif len(subșir) == lungime_maxima and subșir < subșir_maxim: subșir_maxim = subșir # Afișarea subșirului obținut print(subșir_maxim) if __name__ == "__main__": main() </syntaxhighlight>
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