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| 2 | jiangly | 3823 |
| 3 | Benq | 3738 |
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| 6 | orzdevinwang | 3529 |
| 7 | ecnerwala | 3446 |
| 8 | Um_nik | 3396 |
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| 7 | awoo | 157 |
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| 9 | Dominater069 | 153 |
| 9 | nor | 153 |
You can watch the questions here.It was one of the questions in our school question bank and I tried to solve it, but unluckily that I didn't know how. Can you help me find the official solution to this problem (or this contest)? Thank you!
Sorry, my English isn't very good.:<
I don't know how to do this question, but I think it will use dsu on tree.