Count Subarrays
Practice
4.9 (9 votes)
Bit manipulation
Basic programming
Bit manipulation
Algorithms
Observation
Basics of bit manipulation
Mathematics
Problem
64% Success 2071 Attempts 30 Points 1s Time Limit 256MB Memory 1024 KB Max Code

You are given an array \(A\) of size \(N\). Your task is to find the number of subarrays within the given array such that the Bitwise XOR of all elements in the subarray has an odd number of set bits (i.e., 1s).

The subarray of \(A\) is a contiguous part of the array \(A\), i. e. the array \(A_i, A_{i + 1}, ...., A_j\) for some \(1 \leq i \leq j \leq N\).

Input format

  • The first line contains a single integer \(T\), which denotes the number of test cases.
  • For each test case:
    • The first line contains \(N\) denoting the size of array \(A\).
    • The second line contains \(N\) space-separated integers, denoting the elements of \(A\).

Output format

For each test case, print the number of subarrays within the given array such that the Bitwise XOR of all elements in the subarray has an odd number of set bits (i.e., 1s) in a new line.

Constraints

\(1 \leq T \leq 10^5 \\ 1 \leq N \leq 10^6 \\ 1≤A[i]≤10^9\ ∀\ i∈[1,N] \\ \text{The sum of all values of N over all test cases doesn't exceed } 10^6\)

 

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