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

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

Leetcode Solutions

Prefix XOR and Hash Map Approach

  1. Initialize a hash map to store the frequency and sum of indices for each XOR value.
  2. Initialize variables for the current XOR (curXOR), the result (res), and the count of zeros (countZeros).
  3. Iterate through the array, updating curXOR with the XOR of the current element.
  4. If curXOR is in the hash map, update res by adding the product of the current index and the frequency of curXOR minus the sum of indices where curXOR occurred.
  5. Update the hash map with the new frequency and sum of indices for curXOR.
  6. After the loop, return res as the total count of triplets.
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Brute Force with Prefix XOR

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