I have trouble with this problem:
I thought it is the same as this problem:
http://www.spoj.pl/problems/PROFIT/
I thought it is a maximum closure problem and I solved it using network flows, but I failed on the first one. Can anyone tell me why or give me some hints?
| № | Пользователь | Рейтинг |
|---|---|---|
| 1 | jiangly | 3810 |
| 2 | Benq | 3676 |
| 3 | Kevin114514 | 3655 |
| 4 | maroonrk | 3463 |
| 5 | strapple | 3390 |
| 6 | Um_nik | 3387 |
| 7 | tourist | 3384 |
| 8 | heuristica | 3322 |
| 9 | turmax | 3319 |
| 10 | jiangbowen | 3291 |
| Страны | Города | Организации | Всё → |
| № | Пользователь | Вклад |
|---|---|---|
| 1 | Qingyu | 156 |
| 2 | nik_exists | 150 |
| 2 | maspy | 150 |
| 4 | Um_nik | 144 |
| 5 | Errichto | 139 |
| 6 | adamant | 137 |
| 6 | AmShZ | 137 |
| 8 | BledDest | 132 |
| 8 | maroonrk | 132 |
| 10 | qwexd | 129 |
Can you provide working link to the first problem?
UPD: The link is actually works in FF, but opera can't open it.
I think this is what you need.
I know it is a maximum closure problem actually, however, I got WA, and I want to find out why it's not correct.