How to solve the following recurrence relation for N ≤109
F(n)=F(n−1)+F(n−2)+F(n−1)∗F(n−2)
(Assuming that we are provided with the values of F(1) and F(2) )
(EDIT: The problem link is attached.)
# | User | Rating |
---|---|---|
1 | tourist | 4009 |
2 | jiangly | 3773 |
3 | Radewoosh | 3646 |
4 | ecnerwala | 3624 |
5 | jqdai0815 | 3620 |
5 | Benq | 3620 |
7 | orzdevinwang | 3612 |
8 | Geothermal | 3569 |
8 | cnnfls_csy | 3569 |
10 | gyh20 | 3447 |
# | User | Contrib. |
---|---|---|
1 | awoo | 161 |
2 | maomao90 | 160 |
3 | nor | 157 |
4 | atcoder_official | 156 |
4 | cry | 156 |
6 | -is-this-fft- | 155 |
7 | maroonrk | 154 |
8 | adamant | 153 |
9 | Um_nik | 151 |
10 | djm03178 | 146 |
How to solve the following recurrence relation for N ≤109
F(n)=F(n−1)+F(n−2)+F(n−1)∗F(n−2)
(Assuming that we are provided with the values of F(1) and F(2) )
(EDIT: The problem link is attached.)
Here is the link to the problem . I have gone through the editorial but didn't got the approach ( Although I got that we don't need to take more than 2 occurences of a partical triplet [x1,x1+1,x1+2] ) ,I was thinking of DP with three states position i, frequency of i-1th character we took and frequency of i-2nd character we took.
But wasn't able to come up with a solution. Can anybody help me with the solution ?
How to approach Constructive Algorithm problems?
Can you share some of the good problems ?
Name |
---|