Solution: Count Triplets That Can Form Two Arrays of Equal XOR
Explore how to find triplets of indices in an array where the XOR of two subarrays are equal. Understand the prefix XOR technique and hash maps to optimize from O(n^3) to O(n) time, enabling efficient bitwise manipulation for coding interview problems.
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We'll cover the following...
Statement
Given an array of integers, arr, we need to find three indices, i, j, and k, such that i j k arr.length.
We define two values, a and b, as follows:
a = arr[i] ^ arr[i + 1] ^ ... ^ arr[j - 1]b = arr[j] ^ arr[j + 1] ^ ... ^ arr[k]
Note: ^ denotes the bitwise XOR operation.
Return the count of triplets (i, j, k) for which a is equal to b.
Constraints:
arr.length...