Hello, i am struggling to solve this problem from SPOJ. Can anybody give me some hints? Thanks in advance!
→ Pay attention
→ Top rated
| # | User | Rating |
|---|---|---|
| 1 | jiangly | 3977 |
| 2 | tourist | 3815 |
| 3 | jqdai0815 | 3682 |
| 4 | ksun48 | 3614 |
| 5 | orzdevinwang | 3526 |
| 6 | ecnerwala | 3514 |
| 7 | Benq | 3483 |
| 8 | hos.lyric | 3381 |
| 9 | gamegame | 3374 |
| 10 | heuristica | 3358 |
→ Top contributors
| # | User | Contrib. |
|---|---|---|
| 1 | cry | 170 |
| 2 | -is-this-fft- | 162 |
| 2 | Um_nik | 162 |
| 4 | atcoder_official | 160 |
| 5 | djm03178 | 157 |
| 5 | Dominater069 | 157 |
| 7 | adamant | 154 |
| 8 | luogu_official | 152 |
| 8 | awoo | 152 |
| 10 | TheScrasse | 147 |
→ Find user
→ Recent actions
Codeforces (c) Copyright 2010-2025 Mike Mirzayanov
The only programming contests Web 2.0 platform
Server time: Jan/05/2025 18:16:31 (i2).
Desktop version, switch to mobile version.
Supported by
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