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Fibonacci algorithm in O(1) ;)
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| SQRT_5 = Math.sqrt(5) | |
| GOLDEN_NUMBER = (1+SQRT_5)/2 | |
| def fib(n) | |
| (1/SQRT_5*(GOLDEN_NUMBER**n-(-1/GOLDEN_NUMBER)**n)).to_i | |
| end | |
| puts fib(7) |
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