| № | Пользователь | Рейтинг |
|---|---|---|
| 1 | jiangly | 3898 |
| 2 | tourist | 3840 |
| 3 | orzdevinwang | 3706 |
| 4 | ksun48 | 3691 |
| 5 | jqdai0815 | 3682 |
| 6 | ecnerwala | 3525 |
| 7 | gamegame | 3477 |
| 8 | Benq | 3468 |
| 9 | Ormlis | 3381 |
| 10 | maroonrk | 3379 |
| Страны | Города | Организации | Всё → |
| № | Пользователь | Вклад |
|---|---|---|
| 1 | cry | 168 |
| 2 | -is-this-fft- | 164 |
| 3 | Dominater069 | 160 |
| 4 | Um_nik | 159 |
| 5 | atcoder_official | 158 |
| 6 | djm03178 | 154 |
| 7 | adamant | 153 |
| 8 | awoo | 148 |
| 8 | luogu_official | 148 |
| 10 | TheScrasse | 146 |
This is my first post on codeforces, so I apologize for the quality. In the last 1004th round, I tilted hard because of Task A. I think there's a mistake in the tests here. Can someone explain me why I got WA in test case 2. There was x = 1 and y = 9. So if we take n=9 S(9)=9 and S(n+1)=S(10)=1, and the answer is YES.
Auto comment: topic has been updated by Qw04_Dragoknight (previous revision, new revision, compare).
if x=9 and y=1 then n=9, s(9)=9=x and s(9+1)=s(10)=1=y but there is x=1 and y=9 so, NO is correct answer and YES is wrong answer
Oh, thank you I thought the order of x and y was not important...
Auto comment: topic has been updated by Qw04_Dragoknight (previous revision, new revision, compare).
Auto comment: topic has been updated by Qw04_Dragoknight (previous revision, new revision, compare).
You found a value of n satisfying $$$S(n) = 9$$$ and $$$S(n + 1) = 1$$$, but they asked if there exists $$$n$$$ such that $$$S(n) = 1$$$ and $$$S(n + 1) = 9$$$. You interchanged $$$x$$$ and $$$y$$$.
Thank you, I didn't attach importance to the order of x and y...