| № | Пользователь | Рейтинг |
|---|---|---|
| 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 |
| Страны | Города | Организации | Всё → |
| № | Пользователь | Вклад |
|---|---|---|
| 1 | awoo | 161 |
| 2 | maomao90 | 160 |
| 3 | nor | 157 |
| 4 | atcoder_official | 156 |
| 4 | cry | 156 |
| 6 | -is-this-fft- | 155 |
| 7 | maroonrk | 154 |
| 7 | adamant | 154 |
| 9 | Um_nik | 151 |
| 10 | djm03178 | 146 |
I solved problems A–D, but I was quite slow, also I had two incorrect submissions for problem A, so my rating delta was -21.
If you want to watch my screencast and editorial, it will appear (UPD: has appeared) behind this link in several minutes: https://youtu.be/NuyV1LIMX3E; or in this box:
And, of course, my warmest congratulations to tourist on reaching 4000 rating points milestone!
Thanks, I always do appreciate your editorials!
in the tutorial for problem Div1C you stated that
if a = x mod m and b = x mod m then a + b = 2x mod m and then you said its the same as
(a + b) / 2 = x mod m this is actually false and the only reason it held is because the coefficient of x which is 2 always coprimes with m as m was an odd numbers in your example and very clear it didnt hold for powers of 2