Given the frequency of each lowercase character f(a), f(b)... f(z) and k. Compute the number of unique strings of length k having sorted characters.
k <= 10^5
Sum(f(i)) <= 10^5
Please provide Hints/Approach to solve this problem.
№ | Пользователь | Рейтинг |
---|---|---|
1 | tourist | 3690 |
2 | jiangly | 3647 |
3 | Benq | 3581 |
4 | orzdevinwang | 3570 |
5 | Geothermal | 3569 |
5 | cnnfls_csy | 3569 |
7 | Radewoosh | 3509 |
8 | ecnerwala | 3486 |
9 | jqdai0815 | 3474 |
10 | gyh20 | 3447 |
Страны | Города | Организации | Всё → |
№ | Пользователь | Вклад |
---|---|---|
1 | maomao90 | 173 |
2 | awoo | 164 |
3 | adamant | 163 |
4 | TheScrasse | 160 |
5 | nor | 157 |
6 | maroonrk | 156 |
7 | -is-this-fft- | 152 |
8 | Petr | 146 |
8 | orz | 146 |
10 | pajenegod | 145 |
How to solve this combinatorics problem ?
Given the frequency of each lowercase character f(a), f(b)... f(z) and k. Compute the number of unique strings of length k having sorted characters.
k <= 10^5
Sum(f(i)) <= 10^5
Please provide Hints/Approach to solve this problem.
Rev. | Язык | Кто | Когда | Δ | Комментарий | |
---|---|---|---|---|---|---|
en1 | sandeep007 | 2019-04-27 21:26:36 | 280 | Initial revision (published) |
Название |
---|