|| ||Code Submission Evaluation System
CSES Problem Set
Task | Statistics
CSES - Distance Queries
|Time limit:||1.00 s
||Memory limit:||512 MB|
You are given a tree that consists of $n$ nodes.
Your task is to process $q$ queries of the form: what is the distance between nodes $a$ and $b$?
The first input line contains two integers $n$ and $q$: the number of nodes and queries. The nodes are numbered $1,2,\ldots,n$.
Then there are $n-1$ lines that describe the edges. Each line contains two integers $a$ and $b$: there is an edge between nodes $a$ and $b$.
Finally, there are $q$ lines that describe the queries. Each line contains two integer $a$ and $b$: what is the distance between nodes $a$ and $b$?
Print $q$ integers: the answer to each query.
- $1 \le n, q \le 2 \cdot 10^5$
- $1 \le a,b \le n$