I would like to address the similarity noticed in my solution.

The core idea of the problem is to count subarrays with XOR = 0, which can be handled using prefix XOR where the condition becomes pref[r] = pref[l-1].

For the array [1..n], the prefix XOR values follow a fixed repeating pattern depending on i mod 4. This greatly restricts the number of distinct states and introduces a clear periodic structure.

Based on this, the approach is to:

• group indices before x according to their prefix XOR,
• group indices from x onward similarly,
• and count valid pairs by matching equal XOR groups.

Because of the periodic behavior, the solution boils down to evaluating only a small number of cases, leading to a direct formula based on counts of indices with specific mod 4 values.

This approach is a natural consequence of the mathematical properties of the sequence and matches the general idea described in the editorial. As a result, independently derived solutions are likely to look very similar in logic and structure.

I wrote my code independently during the contest without consulting any external material.

Hence, any resemblance is due to the inherent nature of the problem rather than any form of collaboration.

Submission: https://mirror.codeforces.com/contest/2225/submission/372032850

I kindly request the Codeforces team to recheck my submission and review all my submissions in this contest. If possible, please reconsider the skipped/flagged status after verification.

I fully respect the platform’s rules and would appreciate a fair review.