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Amazon Interview Question for Software Engineer / Developers


Country: United States
Interview Type: Phone Interview
More Questions from This Interview



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2
of 2 vote

Use the matrix method. Search the web for more details.

- Anonymous April 04, 2012 | Flag Reply
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1
of 1 vote

You can always use the golden ratio for the equation Fib(n) = (Gr^n-(-Gr)^(-n))/sqrt(5)... if you take the floor of this function that will return the nth fibonacci... a different way is obviously using recursion to do the brute force method... but this can be time and memory costly

- rdo April 03, 2012 | Flag Reply
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0
of 0 votes

Problem with this is floating point will have precision issues because of sqrt(5) and you might get wrong results when n is large. If you try to avoid precision issues and try to compute sqrt(5) using only integer arithmetic, you will realize that a fast way to do that is to first compute Fibonacci numbers!


Matrix method can avoid those issues and only uses integer arithmetic.

- Anonymous April 05, 2012 | Flag
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0
of 0 vote

Golden ratio value: 1.6180

- jane April 03, 2012 | Flag Reply
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0
of 0 vote

f(n) = F(n-1) + F(n-2)

fibbonacci series where f(1) = 1
and f(0) = 0

- DashDash April 04, 2012 | Flag Reply
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0
of 0 vote

geeksforgeeks.org/archives/10120

- dumbhead April 06, 2012 | Flag Reply
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0
of 0 vote

garimaa.blogspot.in/2012/04/program-5th-in-c.html

- two solution with error check involved April 06, 2012 | Flag Reply
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0
of 0 vote

int get_nth_fib(int n) {

return n > 1 ? (get_nth_fib(n-1) + get_nth_fib(n-2)) : 1 ;

}

- Anonymous August 22, 2012 | Flag Reply


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