Hello, i am struggling to solve this problem from SPOJ. Can anybody give me some hints? Thanks in advance!
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| № | Пользователь | Рейтинг |
|---|---|---|
| 1 | Benq | 3792 |
| 2 | VivaciousAubergine | 3647 |
| 3 | Kevin114514 | 3603 |
| 4 | jiangly | 3583 |
| 5 | turmax | 3559 |
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| 9 | dXqwq | 3436 |
| 10 | Otomachi_Una | 3413 |
| Страны | Города | Организации | Всё → |
→ Лидеры (вклад)
| № | Пользователь | Вклад |
|---|---|---|
| 1 | Qingyu | 157 |
| 2 | adamant | 153 |
| 3 | Um_nik | 147 |
| 4 | Proof_by_QED | 146 |
| 5 | Dominater069 | 145 |
| 6 | errorgorn | 141 |
| 7 | cry | 139 |
| 8 | YuukiS | 135 |
| 9 | TheScrasse | 134 |
| 10 | chromate00 | 133 |
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You could change the problem by preprocessing the tree and answering how many nodes in a subtree have a tag ≤ k
To do this, you can collapse the tree using an Euler tour with a segment tree and order the query's to answer them in order (query (id, a, b, x) = (new_query (id, a, x), new_query(id, b, X)) to respond separately) Euler tour, segment tree or bit
i think we can't preprocess the tree, because we have to answer the query online. CMIIW
yeah..., but this is possible