| # | User | Rating |
|---|---|---|
| 1 | tourist | 3803 |
| 2 | jiangly | 3707 |
| 3 | Benq | 3627 |
| 4 | ecnerwala | 3584 |
| 5 | orzdevinwang | 3573 |
| 6 | Geothermal | 3569 |
| 6 | cnnfls_csy | 3569 |
| 8 | Radewoosh | 3542 |
| 9 | jqdai0815 | 3532 |
| 10 | gyh20 | 3447 |
| # | User | Contrib. |
|---|---|---|
| 1 | maomao90 | 165 |
| 2 | awoo | 164 |
| 3 | adamant | 162 |
| 4 | maroonrk | 152 |
| 5 | -is-this-fft- | 151 |
| 5 | nor | 151 |
| 7 | atcoder_official | 147 |
| 8 | TheScrasse | 146 |
| 9 | Petr | 145 |
| 10 | SecondThread | 142 |
[Help] Count number of integers from 1 to n can be represented as ax + by with given positive integers n,a,b and x,y must be natural numbers
Given $$$n, a, b$$$ are all positive numbers $$$(1 \le a, b, n \le 10^{18})$$$.
Count how many numbers from $$$1$$$ to $$$n$$$ that can be represented as $$$a\times x + b\times y$$$ with $$$x,y \ge 0$$$ are arbitrarily non-negative integers.
I only know a $$$O(\sqrt{n})$$$ algorithm.
Thanks.
