chinaxjh's blog

By chinaxjh, history, 2 months ago, In English

We define a function $$$f(x)$$$.And we know the function expression as following.

$$$f(x)=f(x-e)+f(x-2) (x>=3)$$$
$$$f(x)=1 (0<x<3)$$$

ps. $$$e$$$ means the natural base. We will give you an interger $$$x(0<x<=1*10^7)$$$.Please give us the $$$f(x)$$$ in 2 seconds.

For example

Input1

14

Output1

38

Input2

5

Output2

3

Thanks for my friend Kevin.He solved this problem and taught me how to solve it.

 
 
 
 
  • Vote: I like it
  • +4
  • Vote: I do not like it

»
2 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Auto comment: topic has been updated by chinaxjh (previous revision, new revision, compare).

»
7 weeks ago, # |
  Vote: I like it +4 Vote: I do not like it

Hi, would you mind sharing me the approach of this problem? Thanks a lot!