Created
April 1, 2012 10:19
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| def fib_recursive(n): | |
| if n == 1: | |
| return 1 | |
| if n == 2: | |
| return 1 | |
| return fib_recursive(n - 1) + fib_recursive(n - 2) | |
| memo = {} | |
| def fib_memo(n): | |
| if n == 1: | |
| return 1 | |
| if n == 2: | |
| return 1 | |
| if n in memo: | |
| return memo[n] | |
| else: | |
| memo[n] = fib_memo(n - 1) + fib_memo(n - 2) | |
| return memo[n] | |
| def fib_loop(n): | |
| a = 1 | |
| b = 1 | |
| for i in xrange(n - 2): | |
| a, b = a + b, a | |
| return a | |
| if __name__ == "__main__": | |
| fib_recursive(40) | |
| fib_memo(40) | |
| fib_loop(40) |
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