1442 - Count Triplets That Can Form Two Arrays of Equal XOR.

Medium

Given an array of integers arr.

We want to select three indices i, j and k where (0 <= i < j <= k < arr.length).

Let's define a and b as follows:

• a = arr[i] ^ arr[i + 1] ^ ... ^ arr[j - 1]

• b = arr[j] ^ arr[j + 1] ^ ... ^ arr[k]

Note that ^ denotes the bitwise-xor operation.

Return the number of triplets (i, j and k) Where a == b.

Example 1:

Input: arr = 2,3,1,6,7

Output: 4

Explanation: The triplets are (0,1,2), (0,2,2), (2,3,4) and (2,4,4)

Example 2:

Input: arr = 1,1,1,1,1

Output: 10

Constraints:

• 1 <= arr.length <= 300

• <code>1 <= arri<= 10⁸</code>