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0839 - Vraja2
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==Rezolvare== <syntaxhighlight lang="python" line="1"> def calc_nr_vraj(copaci, idx): # Verificam in stanga pana la primul copac cu inaltime mai mare for i in range(idx-1, -1, -1): if copaci[i] > copaci[idx]: return idx - i # Daca nu am gasit copac mai mare in stanga, cautam in dreapta for i in range(idx+1, len(copaci)): if copaci[i] > copaci[idx]: return i - idx # Daca nu am gasit copac mai mare nici in stanga nici in dreapta return 0 def rezolvare(n, copaci): nr_vraj = 0 for i in range(n): nr_vraj += calc_nr_vraj(copaci, i) return nr_vraj def validare(n, copaci): if not (2 <= n <= 10**5): return False for h in copaci: if not (1 <= h <= 10**9): return False return True def main(): n = int(input("Introduceti numarul n: ")) copaci = [] for i in range(n): inaltime = int(input(f"Introduceti inaltimea copacului {i+1}: ")) copaci.append(inaltime) if validare(n, copaci): print("Datele de intrare corespund restrictiilor") nr_vraj = rezolvare(n, copaci) print(f"Numarul minim de vraji necesare este: {nr_vraj}") else: print("Datele de intrare nu corespund cerintei") if __name__ == '__main__': main() </syntaxhighlight>
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