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Even Subsets - Java
Easy Accuracy: 44.88% Submissions: 2187 Points: 2

As we mentioned earlier, bitwise operations can be used to find number of subsets. Here, we will use that.

Given an array A of N elements. The task is to count all the subsets whose sum is even.

Input Format:
For each testcase, first line of input contains number of testcases T. For each testcase, there will be two lines, first of which containing N and next line contains N space seperated positive integers.

Output Format:
For each testcase, print the count of subsets whose sum of all elements is even.

Constraints:
1 <= T <= 100
1 <= N <= 10
1 <= A[i] <= 10

Your task is to complete the function countSumSubsets() which counts all the subsets in which sum of all the elements is even.

Example:
Input:

1
3
1 2 3

Output:
3

Explanation:
Testcase 1:
Three subsets are there whose sum of elements is even. Subsets are (3, 2, 1), (1, 3), (2).

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