递推法就是从0和1开始,前两项相加逐个求出第3、第4个数,直到求出第n个数的值 def fib_loop(n): a, b = 0, 1 for i in range(n): a, b = b, a + b return a for i in range(20): print(fib_loop(i), end=" ") >>> 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610...
下面是我前几天写的另外一段计算fibonacci(n)的代码。因为不知道python是怎样计算大整数加减乘除的,所以我不能简单地说:上面那个时间复杂度为Ο(log(n)),下面这个是Ο(n)。 但你对比一下两者的效率。比如,当n取很大时:10万、100万。前面一个应该会快不少。 def fibonacci(n): l, v = 0, 1 for i ...
def Fibonacci(n):if n == 1:return 1dic = [-1 for i in xrange(n)]dic[0], dic[1] = 1, 1helper(n-1, dic)linesize = 5file=open('Fibonacci.txt', 'w')for loop in range(len(dic)/linesize):line = []for i in range(linesize):line.append(dic[i + linesize * loo...
9)准备参加ACM比赛的Python程序员: 01deffib(n): 02lhm=[[0,1],[1,1]] 03rhm=[[0],[1]] 04em=[[1,0],[0,1]] 05#multiply two matrixes 06defmatrix_mul(lhm,rhm): 07#initialize an empty matrix filled with zero 08result=[[0foriinrange(len(rhm[0]))]forjinrange(len(rhm))] 09...
Python实现 importsys#循环 返回第 n 个数defloop(n):first,second=0,1foriinrange(n):first,second=second,first+secondreturnfirst#循环,返回斐波那契数列deffib(n):v=[0,1]foriinrange(2,n+1):v.append(v[i-1]+v[i-2])returnv# return v[n]if__name__=='__main__':print(fib(int(sys...
9）准备参加ACM比赛的Python程序员： def fib(n): lhm=[[0,1],[1,1]] rhm=[[0],[1]] em=[[1,0],[0,1]] #multiply two matrixes def matrix_mul(lhm,rhm): #initialize an empty matrix filled with zero result=[[0 for i in range(len(rhm[0]))] for j in range(len(...
fibonacci_whileloop_update(n): if n<=1 : return n else: a,b = 0,1 i = 2 while i <= n: a,b = b,a+b i+=1 return b for i in range(100): # print(fibonacci_list(i)) # print(fibonacci_recursion(i)) # print(fibonacci_forloop_update(i)) print(fibonacci_whileloop_update...
Line 13starts aforloopthat iterates from2ton + 1. The loop uses an underscore (_) for the loop variable because it’s a throwaway variable and you won’t be using this value in the code. Line 15computes the next Fibonacci number in the sequence and remembers the previous one. ...
print(','.join(str(i) for i in a)) 分析总结。 不好意思因为才学只能用条件命令和loop结果一 题目 python练习题This question is about Fibonacci number.For your information,the Fibonacci sequence is as follows:0,1,1,2,3,5,8,13,21,34,55,89,144,233,...\x05\x05\x05\x05\x05That is...
For more Practice: Solve these Related Problems: Write a Python program to generate the Fibonacci sequence up to 50 using a while loop. Write a Python program to use recursion to print all Fibonacci numbers less than 50. Write a Python program to build the Fibonacci series up to a given ...