Accademia:Projecteuler 2.py: differenze tra le versioni
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Versione attuale delle 19:49, 15 mag 2011
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ... By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
#!/usr/bin/env python3 import time t = time.time() fibonacci = [1, 1] # potresti partire mettendo nella lista [1, 1] next = fibonacci[-1] + fibonacci[-2] # poi li sommi, ottieni 2 while next < 4000000: fibonacci.append(next) # e con append lo aggiungi, ottenendo [1, 1, 2] next = fibonacci[-1] + fibonacci[-2] # poi sommi gli ultimi due [...] sum_of_evens = 0 for number in fibonacci: if not number % 2: sum_of_evens += number print(sum_of_evens) print(time.time() - t)