| # | User | Rating |
|---|---|---|
| 1 | tourist | 4009 |
| 2 | jiangly | 3823 |
| 3 | Benq | 3738 |
| 4 | Radewoosh | 3633 |
| 5 | jqdai0815 | 3620 |
| 6 | orzdevinwang | 3529 |
| 7 | ecnerwala | 3446 |
| 8 | Um_nik | 3396 |
| 9 | ksun48 | 3390 |
| 10 | gamegame | 3386 |
| # | User | Contrib. |
|---|---|---|
| 1 | cry | 166 |
| 2 | maomao90 | 163 |
| 2 | Um_nik | 163 |
| 4 | atcoder_official | 161 |
| 5 | adamant | 159 |
| 6 | -is-this-fft- | 158 |
| 7 | awoo | 157 |
| 8 | TheScrasse | 154 |
| 9 | nor | 153 |
| 9 | Dominater069 | 153 |
Solution to Exercise 5.2.5* from Competitive Programming 3rd — (Halim) ?
Recently I was studying math and came across this problem:
Given 1 < a < 10, 1 <= n <= 100000, show how to compute the value of: 1 * a + 2 * a^2 + 3 * a^3 + ... + n * a^n efficienty, i.e. in O(log n)!
Could someone give ideas/way to solve this problem?
| Rev. | Lang. | By | When | Δ | Comment | |
|---|---|---|---|---|---|---|
| en2 |
|
caiocandido | 2016-05-22 03:44:28 | 2 | (published) | |
| en1 |
|
caiocandido | 2016-05-22 03:44:05 | 333 | Initial revision (saved to drafts) |
