Given a tree with N nodes rooted at 1. Each node labeled with a value arr[i]. The task is to find the absolute difference between the sum of values of nodes at even level and odd level
Note: All the nodes are numbered from 1 to N.
Input:
1. The first line of the input contains a single integerT denoting the number of test cases. The description of T test cases follows.
2. The first line of each test case contains a single integer N.
3. The next line contains N space-separated positive integers represents the node value.
4. Next N-1 lines contain two space-separated integers u and v, represents an edge in between them
Output: For each test case, print the answer
Constraints:
1. 1 <= T <= 5 2. 1 <= N <= 105 3. 1 <= arr[i] <= 105
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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