The "Mystery Incorporated" once went for an investigation. Since Scooby and Shaggy always create havoc during investigation, Velma decided to give them a question so as to keep them busy.
Velma gave them a tree consisting of N nodes, rooted at node 1 with a number in each node, and asked them several queries. Each query was of the form u l and they had to find the sum of values of all nodes situated at a depth l and were in the subtree of u.
Since Scooby and Shaggy are dumb, they need your help in solving this problem.

Input

The first line will contain the number of test cases T.
The first line of each test case will contain two integers N and Q (1 ≤ N, Q ≤ 100,000) - the number of nodes and the number of queries.
The second line of each test case will contain N integers a₁, a₂, ..., a_N, where a_i (1 ≤ a_i ≤ 10,00,000) is the value stored at the i^th node.
The next N-1 lines of each test case will contain two integers u and v, meaning that there is an edge connecting u and v.
The next Q lines contains the queries each of the form u and l.

Output

For each query in every test case, print the answer to the query on a single line.

Constraints

\( 1 \leq T \leq 5, 1 \leq N, Q \leq 1000, \ 1 \leq a_i \leq 10^6 \) in 35% of test cases.
\( 1 \leq T \leq 10, 1 \leq N, Q \leq 10^5, \ 1 \leq a_i \leq 10^6 \) in 65% of test cases.