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2749 – Tată
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= Exemplul 2: = Intrare 5 2 0 2 5 4 Ieșire NU === Explicație === Nodul <code>4</code> are ca tată pe <code>5</code>, iar nodul <code>5</code> are ca tată pe <code>4</code> == Exemplul 3: == Intrare 100001 Consola Datele nu corespund restrictiilor impuse == Rezolvare == <syntaxhighlight lang="python3"> def sunt_restrictii_incorecte(n, t): # Verifică restricțiile pentru n if not (1 <= n <= 100000): return True # Verifică restricțiile pentru t[i] for i in range(n): if not (0 <= t[i] <= n): return True return False def este_vector_de_tati(t): n = len(t) # Verifică dacă restricțiile sunt respectate if sunt_restrictii_incorecte(n, t): return False # Verifică dacă rădăcina arborelui este corectă if t[0] != 0: return False # Verifică dacă fiecare element al vectorului este un index valid for i in range(1, n): if not (0 <= t[i] < n): return False return True # Citeste numarul n n = int(input("Introduceti numarul n: ")) # Ieși din program dacă restricțiile pentru n nu sunt respectate if n < 1 or n > 100000: print("Datele nu corespund restrictiilor impuse") else: # Citeste vectorul t t = list(map(int, input("Introduceti vectorul t: ").split())) # Verifica daca restrictiile sunt respectate si afiseaza mesajul corespunzator if sunt_restrictii_incorecte(n, t): print("Datele nu corespund restrictiilor impuse") else: # Verifica daca t este vector de tati si afiseaza rezultatul if este_vector_de_tati(t): print("DA") else: print("NU") </syntaxhighlight>
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