Solution: Count Triplets That Can Form Two Arrays of Equal XOR
Explore how to efficiently count triplets in an array where two subarrays have equal XOR values. Learn to apply prefix XOR arrays and hash maps to optimize from cubic to linear time complexity, mastering bitwise operations for coding interview success.
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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:
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