- Time limit: 1.00 s
- Memory limit: 512 MB
You are given a rooted tree consisting of n nodes. The nodes are numbered 1,2,\ldots,n, and node 1 is the root. Each node has a value.
Your task is to process following types of queries:
- change the value of node s to x
- calculate the sum of values on the path from the root to node s
The first input line contains two integers n and q: the number of nodes and queries. The nodes are numbered 1,2,\ldots,n.
The next line has n integers v_1,v_2,\ldots,v_n: the value of each node.
Then there are n-1 lines describing the edges. Each line contains two integers a and b: there is an edge between nodes a and b.
Finally, there are q lines describing the queries. Each query is either of the form "1 s x" or "2 s".
Print the answer to each query of type 2.
- 1 \le n, q \le 2 \cdot 10^5
- 1 \le a,b, s \le n
- 1 \le v_i, x \le 10^9
5 3 4 2 5 2 1 1 2 1 3 3 4 3 5 2 4 1 3 2 2 4