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3945 - Fazan Max
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==Rezolvare== <syntaxhighlight lang="python3" line="1"> def backtracking(current_path, remaining_words, result): if not remaining_words: # Verificăm dacă șirul format este mai lung sau la fel de lung ca rezultatul curent if len(current_path) > len(result): return current_path elif len(current_path) == len(result): # Verificăm dacă șirul curent este lexicografic mai mic current_str = " ".join(current_path) result_str = " ".join(result) if current_str < result_str: return current_path else: return result else: return result last_word = current_path[-1] if current_path else None for word in remaining_words: if last_word is None or last_word[-2:] == word[:2]: new_path = current_path + [word] new_remaining = remaining_words.copy() new_remaining.remove(word) result = backtracking(new_path, new_remaining, result) return result Citirea datelor de intrare n = int(input()) words = input().split() Sortăm cuvintele pentru a îmbunătăți eficiența algoritmului words.sort() Inițializăm rezultatul cu primul cuvânt initial_word = words.pop(0) result = backtracking([initial_word], words, []) Afișăm rezultatul print(" ".join(result)) </syntaxhighlight>
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