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| def fib(n): | |
| if n <= 1: | |
| return n | |
| mem = [0,1] | |
| for i in xrange(2,n+1): | |
| mem[(i+1)%2] = sum(mem) | |
| return max(mem) | |
| def fib(n): | |
| if n <= 1: | |
| return n | |
| prev = 1 | |
| prevprev = 0 | |
| for i in xrange(2,n+1): | |
| prev, prevprev = prevprev + prev, prev | |
| return prev |
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