Click Here i have tried 2 days but i didn't find any solution.i seached in google i found some solution but i couldn't understand of those code. i know LCA,HLD,dfs,segmeent tree.And solved some problem in differnt Oj. So, anyone can help me by sharing an idea how can i solve this problem.And also how can i implement this.
→ Pay attention
→ Streams
→ Top rated
| # | User | Rating |
|---|---|---|
| 1 | Benq | 3792 |
| 2 | VivaciousAubergine | 3647 |
| 3 | Kevin114514 | 3603 |
| 4 | jiangly | 3583 |
| 5 | turmax | 3559 |
| 6 | tourist | 3541 |
| 7 | strapple | 3515 |
| 8 | ksun48 | 3461 |
| 9 | dXqwq | 3436 |
| 10 | Otomachi_Una | 3413 |
→ Top contributors
| # | User | Contrib. |
|---|---|---|
| 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 |
→ Find user
→ Recent actions
Codeforces (c) Copyright 2010-2026 Mike Mirzayanov
The only programming contests Web 2.0 platform
Server time: Apr/21/2026 04:52:12 (h1).
Desktop version, switch to mobile version.
Supported by
It is about Mo's algorithm on trees. http://mirror.codeforces.com/blog/entry/43230
:):)
You are welcome :)