№ | Пользователь | Рейтинг |
---|---|---|
1 | tourist | 3880 |
2 | jiangly | 3669 |
3 | ecnerwala | 3654 |
4 | Benq | 3627 |
5 | orzdevinwang | 3612 |
6 | Geothermal | 3569 |
6 | cnnfls_csy | 3569 |
8 | jqdai0815 | 3532 |
9 | Radewoosh | 3522 |
10 | gyh20 | 3447 |
Страны | Города | Организации | Всё → |
№ | Пользователь | Вклад |
---|---|---|
1 | awoo | 161 |
2 | maomao90 | 160 |
3 | adamant | 157 |
4 | maroonrk | 154 |
5 | -is-this-fft- | 148 |
5 | atcoder_official | 148 |
5 | SecondThread | 148 |
8 | Petr | 147 |
9 | TheScrasse | 145 |
9 | nor | 145 |
Название |
---|
1.Use Linear Sieve to take primes no more than $$$n$$$ out, store them.
2.Use
upper_bound()
to find the position of the smallest prime strictly greater than $$$n$$$. Then we can calculate $$$\pi(n)$$$ easily.3.$$$\forall i: i\ge 0 $$$ and $$$ p_{A\times i+B} \le n$$$, store $$$p_{A\times i+B}$$$ for answer.
4.Output what you stored for answer.
I did this and got AC but I think purpose of problem setter is behind this question is not this so I asked.
There's a time constraint of $$$10$$$ seconds, with $$$1024$$$ MB memory avaliable.
I think the purpose of the author could be that ( enumerate primes )