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0876 - Coada
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==Rezolvare== <syntaxhighlight lang="python" line="1" start="1"> # Definim clasa Queue class Queue: def __init__(self): self.queue = [] # Initializam coada ca o lista goala # Metoda pentru adaugarea unui element in coada def push(self, x): if len(self.queue) < 1000 and -1000000 <= x <= 1000000: # Verificam daca coada nu este plina si daca elementul este in intervalul specificat self.queue.append(x) # Adaugam elementul la sfarsitul cozii # Metoda pentru eliminarea unui element din coada def pop(self): if self.queue: # Verificam daca coada nu este goala self.queue.pop(0) # Eliminam primul element din coada # Metoda pentru a obtine primul element din coada def front(self): if self.queue: # Verificam daca coada nu este goala print(self.queue[0]) # Afisam primul element def verificare_restrictii(nr_n): # functia de verificare a datelor de intrare if 1 <= nr_n <= 1000: return True else: return False if __name__ == '__main__': try: # Cream o instanta a clasei Queue queue = Queue() # Citim numarul de operatii n = int(input("Introduceti numarul de operatii: ")) if verificare_restrictii(n): # verificam datele de intrare print("Datele de intrare corespund restrictiilor impuse.") # Executam operatiile for _ in range(n): operation = input("Introduceti operatia: ").split() # Citim operatia if operation[0] == 'push': # Daca operatia este 'push', adaugam elementul in coada queue.push(int(operation[1])) elif operation[0] == 'pop': # Daca operatia este 'pop', eliminam elementul din coada queue.pop() elif operation[0] == 'front': # Daca operatia este 'front', afisam primul element din coada queue.front() else: print("Datele de intrare nu corespund restrictiilor impuse.") # ne asteptam la 2 tipuri de erori din cauza datelor de intrare, le tratam corespunzator except ValueError: print("Datele de intrare nu corespund restrictiilor impuse.") except IndexError: print("Datele de intrare nu corespund restrictiilor impuse.") </syntaxhighlight>
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